From 27af9e2f8ce483d76082ae5526cbe080d3a3aaca Mon Sep 17 00:00:00 2001 From: YuCheng Hu Date: Fri, 15 Jul 2022 13:10:35 -0400 Subject: [PATCH] Submit all code for code-java-string branch --- .idea/compiler.xml | 38 +++ .idea/encodings.xml | 52 ++++ .idea/jarRepositories.xml | 20 ++ .idea/thriftCompiler.xml | 6 + .idea/vcs.xml | 6 + .../compactstring/CompactStringDemo.java | 21 ++ .../main/java/com/ossez/localization/App.java | 21 ++ .../com/ossez/localization/ICUFormat.java | 29 +++ .../com/ossez/localization/JavaSEFormat.java | 24 ++ .../com/ossez/localization/Localization.java | 18 ++ .../stringperformance/StringPerformance.java | 198 ++++++++++++++ .../src/main/resources/config.properties | 1 + .../src/main/resources/formats_en.properties | 2 + .../src/main/resources/formats_fr.properties | 2 + .../src/main/resources/formats_it.properties | 2 + .../src/main/resources/formats_pl.properties | 2 + .../src/main/resources/messages_en.properties | 1 + .../src/main/resources/messages_fr.properties | 1 + .../src/main/resources/messages_it.properties | 1 + .../src/main/resources/messages_pl.properties | 1 + .../src/main/resources/stephenking.txt | 4 + .../com/ossez/interview/LocaleUnitTest.java | 20 ++ .../interview/StringAnagramUnitTest.java | 29 +++ .../interview/StringChangeCaseUnitTest.java | 20 ++ .../StringCountOccurrencesUnitTest.java | 28 ++ .../ossez/interview/StringFormatUnitTest.java | 14 + .../ossez/interview/StringInternUnitTest.java | 17 ++ .../ossez/interview/StringJoinerUnitTest.java | 19 ++ .../interview/StringPalindromeUnitTest.java | 29 +++ .../interview/StringReverseUnitTest.java | 13 + .../ossez/interview/StringSplitUnitTest.java | 33 +++ .../interview/StringToByteArrayUnitTest.java | 24 ++ .../interview/StringToCharArrayUnitTest.java | 17 ++ .../interview/StringToIntegerUnitTest.java | 17 ++ .../ossez/localization/ICUFormatUnitTest.java | 72 ++++++ .../randomstrings/RandomStringsUnitTest.java | 103 ++++++++ .../core-java-streams-2/README.md | 16 ++ core-java-modules/core-java-streams-2/pom.xml | 40 +++ .../reduce/application/Application.java | 39 +++ .../benchmarks/JMHStreamReduceBenchMark.java | 52 ++++ .../com/baeldung/reduce/entities/User.java | 25 ++ .../reduce/utilities/NumberUtils.java | 52 ++++ .../streams/MyImmutableListCollector.java | 22 ++ .../src/main/resources/logback.xml | 13 + .../IntStreamsConversionsUnitTest.java | 40 +++ .../baeldung/reduce/StreamReduceUnitTest.java | 80 ++++++ .../java/com/baeldung/streams/Detail.java | 13 + .../Java8FindAnyFindFirstUnitTest.java | 46 ++++ .../streams/Java8StreamApiUnitTest.java | 242 ++++++++++++++++++ .../streams/Java8StreamsUnitTest.java | 104 ++++++++ .../com/baeldung/streams/PeekUnitTest.java | 118 +++++++++ .../java/com/baeldung/streams/Product.java | 48 ++++ .../baeldung/streams/StreamAddUnitTest.java | 48 ++++ .../baeldung/streams/StreamMapUnitTest.java | 80 ++++++ .../streams/StreamToImmutableUnitTest.java | 57 +++++ .../StreamOperateAndRemoveUnitTest.java | 80 ++++++ .../core-java-streams-3/README.md | 16 ++ core-java-modules/core-java-streams-3/pom.xml | 73 ++++++ .../closure/StreamClosureSnippets.java | 30 +++ .../conversion/EnumerationSpliterator.java | 30 +++ .../EnumerationStreamConversion.java | 16 ++ .../streams/debug/entity/Customer.java | 19 ++ .../baeldung/streams/forEach/ReverseList.java | 84 ++++++ .../streams/parallel/BenchmarkRunner.java | 9 + .../parallel/DifferentSourceSplitting.java | 54 ++++ .../streams/parallel/MemoryLocalityCosts.java | 52 ++++ .../streams/parallel/MergingCosts.java | 52 ++++ .../streams/parallel/ParallelStream.java | 15 ++ .../streams/parallel/SequentialStream.java | 15 ++ .../streams/parallel/SplittingCosts.java | 27 ++ .../primitivestreams/PrimitiveStreams.java | 23 ++ .../StreamVsCollectionExample.java | 95 +++++++ .../src/main/resources/logback.xml | 13 + .../bigdecimals/AddNumbersUnitTest.java | 42 +++ .../StreamForEachIfElseUnitTest.java | 41 +++ .../EnumerationStreamConversionUnitTest.java | 35 +++ .../com/baeldung/streams/debug/Example1.java | 18 ++ .../com/baeldung/streams/debug/Example2.java | 36 +++ .../streams/parallel/ForkJoinUnitTest.java | 46 ++++ .../PrimitiveStreamsUnitTest.java | 93 +++++++ .../core-java-streams-4/README.md | 3 + core-java-modules/core-java-streams-4/pom.xml | 61 +++++ .../StreamGroupingByCollectorUnitTest.java | 84 ++++++ 83 files changed, 3202 insertions(+) create mode 100644 .idea/compiler.xml create mode 100644 .idea/encodings.xml create mode 100644 .idea/jarRepositories.xml create mode 100644 .idea/thriftCompiler.xml create mode 100644 .idea/vcs.xml create mode 100644 core-java-modules/core-java-numbers/src/main/java/com/ossez/java9/compactstring/CompactStringDemo.java create mode 100644 core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/App.java create mode 100644 core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/ICUFormat.java create mode 100644 core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/JavaSEFormat.java create mode 100644 core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/Localization.java create mode 100644 core-java-modules/core-java-numbers/src/main/java/com/ossez/stringperformance/StringPerformance.java create mode 100644 core-java-modules/core-java-numbers/src/main/resources/config.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/formats_en.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/formats_fr.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/formats_it.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/formats_pl.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/messages_en.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/messages_fr.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/messages_it.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/messages_pl.properties create mode 100644 core-java-modules/core-java-numbers/src/main/resources/stephenking.txt create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/LocaleUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringAnagramUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringChangeCaseUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringCountOccurrencesUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringFormatUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringInternUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringJoinerUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringPalindromeUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringReverseUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringSplitUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToByteArrayUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToCharArrayUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToIntegerUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/localization/ICUFormatUnitTest.java create mode 100644 core-java-modules/core-java-numbers/src/test/java/com/ossez/randomstrings/RandomStringsUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/README.md create mode 100644 core-java-modules/core-java-streams-2/pom.xml create mode 100644 core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java create mode 100644 core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java create mode 100644 core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java create mode 100644 core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java create mode 100644 core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java create mode 100644 core-java-modules/core-java-streams-2/src/main/resources/logback.xml create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java create mode 100644 core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java create mode 100644 core-java-modules/core-java-streams-3/README.md create mode 100644 core-java-modules/core-java-streams-3/pom.xml create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/closure/StreamClosureSnippets.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationSpliterator.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationStreamConversion.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/debug/entity/Customer.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/BenchmarkRunner.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/DifferentSourceSplitting.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MemoryLocalityCosts.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MergingCosts.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/ParallelStream.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SequentialStream.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SplittingCosts.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java create mode 100644 core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/streamvscollection/StreamVsCollectionExample.java create mode 100644 core-java-modules/core-java-streams-3/src/main/resources/logback.xml create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/bigdecimals/AddNumbersUnitTest.java create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conversion/EnumerationStreamConversionUnitTest.java create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example1.java create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example2.java create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/parallel/ForkJoinUnitTest.java create mode 100644 core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java create mode 100644 core-java-modules/core-java-streams-4/README.md create mode 100644 core-java-modules/core-java-streams-4/pom.xml create mode 100644 core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streamcollectors/StreamGroupingByCollectorUnitTest.java diff --git a/.idea/compiler.xml b/.idea/compiler.xml new file mode 100644 index 0000000000..52586a11a5 --- /dev/null +++ b/.idea/compiler.xml @@ -0,0 +1,38 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/encodings.xml b/.idea/encodings.xml new file mode 100644 index 0000000000..1c2aea2778 --- /dev/null +++ b/.idea/encodings.xml @@ -0,0 +1,52 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml new file mode 100644 index 0000000000..712ab9d985 --- /dev/null +++ b/.idea/jarRepositories.xml @@ -0,0 +1,20 @@ + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/thriftCompiler.xml b/.idea/thriftCompiler.xml new file mode 100644 index 0000000000..7bc123c6bc --- /dev/null +++ b/.idea/thriftCompiler.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/.idea/vcs.xml b/.idea/vcs.xml new file mode 100644 index 0000000000..35eb1ddfbb --- /dev/null +++ b/.idea/vcs.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/core-java-modules/core-java-numbers/src/main/java/com/ossez/java9/compactstring/CompactStringDemo.java b/core-java-modules/core-java-numbers/src/main/java/com/ossez/java9/compactstring/CompactStringDemo.java new file mode 100644 index 0000000000..1243ae1b0f --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/java/com/ossez/java9/compactstring/CompactStringDemo.java @@ -0,0 +1,21 @@ +package com.ossez.java9.compactstring; + +import java.util.List; +import java.util.stream.IntStream; + +import static java.util.stream.Collectors.toList; + +public class CompactStringDemo { + + public static void main(String[] args) { + long startTime = System.currentTimeMillis(); + List strings = IntStream.rangeClosed(1, 10_000_000).mapToObj(Integer::toString).collect(toList()); + long totalTime = System.currentTimeMillis() - startTime; + System.out.println("Generated " + strings.size() + " strings in " + totalTime + " ms."); + + startTime = System.currentTimeMillis(); + String appended = (String) strings.stream().limit(100_000).reduce("", (left, right) -> left.toString() + right.toString()); + totalTime = System.currentTimeMillis() - startTime; + System.out.println("Created string of length " + appended.length() + " in " + totalTime + " ms."); + } +} diff --git a/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/App.java b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/App.java new file mode 100644 index 0000000000..3fe6d8a267 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/App.java @@ -0,0 +1,21 @@ +package com.ossez.localization; + +import java.text.ParseException; +import java.util.Arrays; +import java.util.List; +import java.util.Locale; + +public class App { + + /** + * Runs all available formatter + * @throws ParseException + */ + public static void main(String[] args) { + List locales = Arrays.asList(new Locale[] { Locale.UK, Locale.ITALY, Locale.FRANCE, Locale.forLanguageTag("pl-PL") }); + Localization.run(locales); + JavaSEFormat.run(locales); + ICUFormat.run(locales); + } + +} diff --git a/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/ICUFormat.java b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/ICUFormat.java new file mode 100644 index 0000000000..27de6876ee --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/ICUFormat.java @@ -0,0 +1,29 @@ +package com.ossez.localization; + +import com.ibm.icu.text.MessageFormat; + +import java.util.List; +import java.util.Locale; +import java.util.ResourceBundle; + +public class ICUFormat { + + public static String getLabel(Locale locale, Object[] data) { + ResourceBundle bundle = ResourceBundle.getBundle("formats", locale); + String format = bundle.getString("label-icu"); + MessageFormat formatter = new MessageFormat(format, locale); + return formatter.format(data); + } + + public static void run(List locales) { + System.out.println("ICU formatter"); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 0 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 1 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 2 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 3 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 0 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 1 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 2 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 3 }))); + } +} diff --git a/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/JavaSEFormat.java b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/JavaSEFormat.java new file mode 100644 index 0000000000..cfffa70323 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/JavaSEFormat.java @@ -0,0 +1,24 @@ +package com.ossez.localization; + +import java.text.MessageFormat; +import java.util.Date; +import java.util.List; +import java.util.Locale; +import java.util.ResourceBundle; + +public class JavaSEFormat { + + public static String getLabel(Locale locale, Object[] data) { + ResourceBundle bundle = ResourceBundle.getBundle("formats", locale); + final String pattern = bundle.getString("label"); + final MessageFormat formatter = new MessageFormat(pattern, locale); + return formatter.format(data); + } + + public static void run(List locales) { + System.out.println("Java formatter"); + final Date date = new Date(System.currentTimeMillis()); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { date, "Alice", 0 }))); + locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { date, "Alice", 2 }))); + } +} diff --git a/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/Localization.java b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/Localization.java new file mode 100644 index 0000000000..945baf4ee9 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/java/com/ossez/localization/Localization.java @@ -0,0 +1,18 @@ +package com.ossez.localization; + +import java.util.List; +import java.util.Locale; +import java.util.ResourceBundle; + +public class Localization { + + public static String getLabel(Locale locale) { + final ResourceBundle bundle = ResourceBundle.getBundle("messages", locale); + return bundle.getString("label"); + } + + public static void run(List locales) { + locales.forEach(locale -> System.out.println(getLabel(locale))); + } + +} diff --git a/core-java-modules/core-java-numbers/src/main/java/com/ossez/stringperformance/StringPerformance.java b/core-java-modules/core-java-numbers/src/main/java/com/ossez/stringperformance/StringPerformance.java new file mode 100644 index 0000000000..06c874e3db --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/java/com/ossez/stringperformance/StringPerformance.java @@ -0,0 +1,198 @@ +package com.ossez.stringperformance; + +import com.google.common.base.Splitter; +import org.apache.commons.lang3.StringUtils; +import org.openjdk.jmh.annotations.*; +import org.openjdk.jmh.runner.Runner; +import org.openjdk.jmh.runner.options.Options; +import org.openjdk.jmh.runner.options.OptionsBuilder; + +import java.util.ArrayList; +import java.util.List; +import java.util.StringTokenizer; +import java.util.concurrent.TimeUnit; +import java.util.regex.Pattern; + +@BenchmarkMode(Mode.SingleShotTime) +@OutputTimeUnit(TimeUnit.MILLISECONDS) +@Measurement(batchSize = 100000, iterations = 10) +@Warmup(batchSize = 100000, iterations = 10) +@State(Scope.Thread) +public class StringPerformance { + + protected String baeldung = "baeldung"; + protected String longString = "Hello baeldung, I am a bit longer than other Strings"; + protected String formatString = "hello %s, nice to meet you"; + protected String formatDigit = "%d"; + protected String emptyString = " "; + protected String result = ""; + + protected int sampleNumber = 100; + + protected Pattern spacePattern = Pattern.compile(emptyString); + protected Pattern longPattern = Pattern.compile(longString); + protected List stringSplit = new ArrayList<>(); + protected List stringTokenizer = new ArrayList<>(); + + @Benchmark + public String benchmarkStringDynamicConcat() { + result += baeldung; + return result; + } + + @Benchmark + public StringBuilder benchmarkStringBuilder() { + StringBuilder stringBuilder = new StringBuilder(result); + stringBuilder.append(baeldung); + return stringBuilder; + } + + @Benchmark + public StringBuffer benchmarkStringBuffer() { + StringBuffer stringBuffer = new StringBuffer(result); + stringBuffer.append(baeldung); + return stringBuffer; + } + + @Benchmark + public String benchmarkStringConstructor() { + String result = new String("baeldung"); + return result; + } + + @Benchmark + public String benchmarkStringLiteral() { + String result = "baeldung"; + return result; + } + + @Benchmark + public String benchmarkStringFormat_s() { + return String.format(formatString, baeldung); + } + + @Benchmark + public String benchmarkStringConcat() { + result = result.concat(baeldung); + return result; + } + + @Benchmark + public String benchmarkStringIntern() { + return baeldung.intern(); + } + + @Benchmark + public String benchmarkStringReplace() { + return longString.replace("average", " average !!!"); + } + + @Benchmark + public String benchmarkStringUtilsReplace() { + return StringUtils.replace(longString, "average", " average !!!"); + } + + @Benchmark + public List benchmarkGuavaSplitter() { + return Splitter.on(" ").trimResults() + .omitEmptyStrings() + .splitToList(longString); + } + + @Benchmark + public String [] benchmarkStringSplit() { + return longString.split(emptyString); + } + + @Benchmark + public String [] benchmarkStringSplitPattern() { + return spacePattern.split(longString, 0); + } + + @Benchmark + public List benchmarkStringTokenizer() { + StringTokenizer st = new StringTokenizer(longString); + while (st.hasMoreTokens()) { + stringTokenizer.add(st.nextToken()); + } + return stringTokenizer; + } + + @Benchmark + public List benchmarkStringIndexOf() { + int pos = 0, end; + while ((end = longString.indexOf(' ', pos)) >= 0) { + stringSplit.add(longString.substring(pos, end)); + pos = end + 1; + } + //Add last token of string + stringSplit.add(longString.substring(pos)); + return stringSplit; + } + + @Benchmark + public String benchmarkIntegerToString() { + return Integer.toString(sampleNumber); + } + + @Benchmark + public String benchmarkStringValueOf() { + return String.valueOf(sampleNumber); + } + + + @Benchmark + public String benchmarkStringConvertPlus() { + return sampleNumber + ""; + } + + @Benchmark + public String benchmarkStringFormat_d() { + return String.format(formatDigit, sampleNumber); + } + + @Benchmark + public boolean benchmarkStringEquals() { + return longString.equals(baeldung); + } + + + @Benchmark + public boolean benchmarkStringEqualsIgnoreCase() { + return longString.equalsIgnoreCase(baeldung); + } + + @Benchmark + public boolean benchmarkStringMatches() { + return longString.matches(baeldung); + } + + @Benchmark + public boolean benchmarkPrecompiledMatches() { + return longPattern.matcher(baeldung).matches(); + } + + @Benchmark + public int benchmarkStringCompareTo() { + return longString.compareTo(baeldung); + } + + @Benchmark + public boolean benchmarkStringIsEmpty() { + return longString.isEmpty(); + } + + @Benchmark + public boolean benchmarkStringLengthZero() { + return longString.length() == 0; + } + + public static void main(String[] args) throws Exception { + Options options = new OptionsBuilder() + .include(StringPerformance.class.getSimpleName()).threads(1) + .forks(1).shouldFailOnError(true) + .shouldDoGC(true) + .jvmArgs("-server").build(); + new Runner(options).run(); + } +} diff --git a/core-java-modules/core-java-numbers/src/main/resources/config.properties b/core-java-modules/core-java-numbers/src/main/resources/config.properties new file mode 100644 index 0000000000..088ed029d7 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/config.properties @@ -0,0 +1 @@ +string.too.long= StringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTo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ngStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongString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ngTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLongStringTooLong diff --git a/core-java-modules/core-java-numbers/src/main/resources/formats_en.properties b/core-java-modules/core-java-numbers/src/main/resources/formats_en.properties new file mode 100644 index 0000000000..4bea9a74bb --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/formats_en.properties @@ -0,0 +1,2 @@ +label=On {0, date, short} {1} has sent you {2, choice, 0#no messages|1#a message|2#two messages|2<{2,number,integer} messages}. +label-icu={0} has sent you {2, plural, =0 {no messages} =1 {a message} other {{2, number, integer} messages}}. diff --git a/core-java-modules/core-java-numbers/src/main/resources/formats_fr.properties b/core-java-modules/core-java-numbers/src/main/resources/formats_fr.properties new file mode 100644 index 0000000000..7f509d494e --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/formats_fr.properties @@ -0,0 +1,2 @@ +label={0, date, short}, {1}{2, choice, 0# ne|0<} vous a envoy\u00e9 {2, choice, 0#aucun message|1#un message|2#deux messages|2<{2,number,integer} messages}. +label-icu={0} {2, plural, =0 {ne } other {}}vous a envoy\u00e9 {2, plural, =0 {aucun message} =1 {un message} other {{2, number, integer} messages}}. diff --git a/core-java-modules/core-java-numbers/src/main/resources/formats_it.properties b/core-java-modules/core-java-numbers/src/main/resources/formats_it.properties new file mode 100644 index 0000000000..fe061ae1b6 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/formats_it.properties @@ -0,0 +1,2 @@ +label={0, date, short} {1} ti ha inviato {2, choice, 0#nessun messagio|1#un messaggio|2#due messaggi|2<{2, number, integer} messaggi}. +label-icu={0} {2, plural, =0 {non } other {}}ti ha inviato {2, plural, =0 {nessun messaggio} =1 {un messaggio} other {{2, number, integer} messaggi}}. diff --git a/core-java-modules/core-java-numbers/src/main/resources/formats_pl.properties b/core-java-modules/core-java-numbers/src/main/resources/formats_pl.properties new file mode 100644 index 0000000000..9333ec3396 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/formats_pl.properties @@ -0,0 +1,2 @@ +label=W {0, date, short} {1}{2, choice, 0# nie|0<} wys\u0142a\u0142a ci {2, choice, 0#\u017Cadnych wiadomo\u015Bci|1#wiadomo\u015B\u0107|2#dwie wiadomo\u015Bci|2<{2, number, integer} wiadomo\u015Bci}. +label-icu={0} {2, plural, =0 {nie } other {}}{1, select, male {wys\u0142a\u0142} female {wys\u0142a\u0142a} other {wys\u0142a\u0142o}} ci {2, plural, =0 {\u017Cadnej wiadomo\u015Bci} =1 {wiadomo\u015B\u0107} other {{2, number, integer} wiadomo\u015Bci}}. diff --git a/core-java-modules/core-java-numbers/src/main/resources/messages_en.properties b/core-java-modules/core-java-numbers/src/main/resources/messages_en.properties new file mode 100644 index 0000000000..bcbca9483c --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/messages_en.properties @@ -0,0 +1 @@ +label=Alice has sent you a message. diff --git a/core-java-modules/core-java-numbers/src/main/resources/messages_fr.properties b/core-java-modules/core-java-numbers/src/main/resources/messages_fr.properties new file mode 100644 index 0000000000..15ad031a30 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/messages_fr.properties @@ -0,0 +1 @@ +label=Alice vous a envoy\u00e9 un message. diff --git a/core-java-modules/core-java-numbers/src/main/resources/messages_it.properties b/core-java-modules/core-java-numbers/src/main/resources/messages_it.properties new file mode 100644 index 0000000000..93b99a9483 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/messages_it.properties @@ -0,0 +1 @@ +label=Alice ti ha inviato un messaggio. diff --git a/core-java-modules/core-java-numbers/src/main/resources/messages_pl.properties b/core-java-modules/core-java-numbers/src/main/resources/messages_pl.properties new file mode 100644 index 0000000000..a64066deea --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/messages_pl.properties @@ -0,0 +1 @@ +label=Alice wys\u0142a\u0142a ci wiadomo\u015B\u0107. diff --git a/core-java-modules/core-java-numbers/src/main/resources/stephenking.txt b/core-java-modules/core-java-numbers/src/main/resources/stephenking.txt new file mode 100644 index 0000000000..f31b4a28bd --- /dev/null +++ b/core-java-modules/core-java-numbers/src/main/resources/stephenking.txt @@ -0,0 +1,4 @@ +Get busy living +or +get busy dying. +--Stephen King \ No newline at end of file diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/LocaleUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/LocaleUnitTest.java new file mode 100644 index 0000000000..71c17354c2 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/LocaleUnitTest.java @@ -0,0 +1,20 @@ +package com.ossez.interview; + +import org.junit.Test; + +import java.math.BigDecimal; +import java.text.NumberFormat; +import java.util.Locale; + +import static org.junit.Assert.assertEquals; + +public class LocaleUnitTest { + @Test + public void whenUsingLocal_thenCorrectResultsForDifferentLocale() { + Locale usLocale = Locale.US; + BigDecimal number = new BigDecimal(102_300.456d); + + NumberFormat usNumberFormat = NumberFormat.getCurrencyInstance(usLocale); + assertEquals(usNumberFormat.format(number), "$102,300.46"); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringAnagramUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringAnagramUnitTest.java new file mode 100644 index 0000000000..05c82f69ed --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringAnagramUnitTest.java @@ -0,0 +1,29 @@ +package com.ossez.interview; + +import org.junit.Test; + +import java.util.Arrays; + +import static org.assertj.core.api.Assertions.assertThat; + +public class StringAnagramUnitTest { + public boolean isAnagram(String s1, String s2) { + if(s1.length() != s2.length()) + return false; + + char[] arr1 = s1.toCharArray(); + char[] arr2 = s2.toCharArray(); + + Arrays.sort(arr1); + Arrays.sort(arr2); + + return Arrays.equals(arr1, arr2); + } + + @Test + public void whenTestAnagrams_thenTestingCorrectly() { + assertThat(isAnagram("car", "arc")).isTrue(); + assertThat(isAnagram("west", "stew")).isTrue(); + assertThat(isAnagram("west", "east")).isFalse(); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringChangeCaseUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringChangeCaseUnitTest.java new file mode 100644 index 0000000000..c283c5027c --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringChangeCaseUnitTest.java @@ -0,0 +1,20 @@ +package com.ossez.interview; + +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +public class StringChangeCaseUnitTest { + @Test + public void givenString_whenChangingToUppercase_thenCaseChanged() { + String s = "Welcome to Baeldung!"; + assertEquals("WELCOME TO BAELDUNG!", s.toUpperCase()); + } + + + @Test + public void givenString_whenChangingToLowerrcase_thenCaseChanged() { + String s = "Welcome to Baeldung!"; + assertEquals("welcome to baeldung!", s.toLowerCase()); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringCountOccurrencesUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringCountOccurrencesUnitTest.java new file mode 100644 index 0000000000..99f9913d79 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringCountOccurrencesUnitTest.java @@ -0,0 +1,28 @@ +package com.ossez.interview; + +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +public class StringCountOccurrencesUnitTest { + public int countOccurrences(String s, char c) { + int count = 0; + for (int i = 0; i < s.length(); i++) { + if (s.charAt(i) == c) { + count++; + } + } + return count; + } + + @Test + public void givenString_whenCountingFrequencyOfChar_thenCountCorrect() { + assertEquals(3, countOccurrences("united states", 't')); + } + + public void givenString_whenUsingJava8_thenCountingOfCharCorrect() { + String str = "united states"; + long count = str.chars().filter(ch -> (char)ch == 't').count(); + assertEquals(3, count); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringFormatUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringFormatUnitTest.java new file mode 100644 index 0000000000..1b481979a9 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringFormatUnitTest.java @@ -0,0 +1,14 @@ +package com.ossez.interview; + +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +public class StringFormatUnitTest { + @Test + public void givenString_whenUsingStringFormat_thenStringFormatted() { + String title = "Baeldung"; + String formatted = String.format("Title is %s", title); + assertEquals(formatted, "Title is Baeldung"); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringInternUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringInternUnitTest.java new file mode 100644 index 0000000000..e11e4a8022 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringInternUnitTest.java @@ -0,0 +1,17 @@ +package com.ossez.interview; + +import org.junit.Test; + +import static org.assertj.core.api.Assertions.assertThat; + +public class StringInternUnitTest { + @Test + public void whenCallingStringIntern_thenStringsInterned() { + String s1 = "Baeldung"; + String s2 = new String("Baeldung"); + String s3 = new String("Baeldung").intern(); + + assertThat(s1 == s2).isFalse(); + assertThat(s1 == s3).isTrue(); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringJoinerUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringJoinerUnitTest.java new file mode 100644 index 0000000000..15c1c381f5 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringJoinerUnitTest.java @@ -0,0 +1,19 @@ +package com.ossez.interview; + +import org.junit.Test; + +import java.util.StringJoiner; + +import static org.junit.Assert.assertEquals; + +public class StringJoinerUnitTest { + @Test + public void whenUsingStringJoiner_thenStringsJoined() { + StringJoiner joiner = new StringJoiner(",", "[", "]"); + joiner.add("Red") + .add("Green") + .add("Blue"); + + assertEquals(joiner.toString(), "[Red,Green,Blue]"); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringPalindromeUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringPalindromeUnitTest.java new file mode 100644 index 0000000000..599e3dda22 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringPalindromeUnitTest.java @@ -0,0 +1,29 @@ +package com.ossez.interview; + +import org.junit.Test; + +import static org.assertj.core.api.Assertions.assertThat; + +public class StringPalindromeUnitTest { + + public boolean isPalindrome(String text) { + int forward = 0; + int backward = text.length() - 1; + while (backward > forward) { + char forwardChar = text.charAt(forward++); + char backwardChar = text.charAt(backward--); + if (forwardChar != backwardChar) + return false; + } + return true; + } + + @Test + public void givenIsPalindromeMethod_whenCheckingString_thenFindIfPalindrome() { + assertThat(isPalindrome("madam")).isTrue(); + assertThat(isPalindrome("radar")).isTrue(); + assertThat(isPalindrome("level")).isTrue(); + + assertThat(isPalindrome("baeldung")).isFalse(); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringReverseUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringReverseUnitTest.java new file mode 100644 index 0000000000..f91b2071ab --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringReverseUnitTest.java @@ -0,0 +1,13 @@ +package com.ossez.interview; + +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +public class StringReverseUnitTest { + @Test + public void whenUsingInbuildMethods_thenStringReversed() { + String reversed = new StringBuilder("baeldung").reverse().toString(); + assertEquals("gnudleab", reversed); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringSplitUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringSplitUnitTest.java new file mode 100644 index 0000000000..24f8eb1a2e --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringSplitUnitTest.java @@ -0,0 +1,33 @@ +package com.ossez.interview; + +import org.apache.commons.lang3.StringUtils; +import org.junit.Test; + +import static org.junit.Assert.assertArrayEquals; + +public class StringSplitUnitTest { + @Test + public void givenCoreJava_whenSplittingStrings_thenSplitted() { + String expected[] = { + "john", + "peter", + "mary" + }; + + String[] splitted = "john,peter,mary".split(","); + assertArrayEquals( expected, splitted ); + } + + @Test + public void givenApacheCommons_whenSplittingStrings_thenSplitted() { + String expected[] = { + "john", + "peter", + "mary" + }; + String[] splitted = StringUtils.split("john peter mary"); + assertArrayEquals( expected, splitted ); + } + + +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToByteArrayUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToByteArrayUnitTest.java new file mode 100644 index 0000000000..cf2327668e --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToByteArrayUnitTest.java @@ -0,0 +1,24 @@ +package com.ossez.interview; + +import org.junit.Test; + +import java.io.UnsupportedEncodingException; +import java.nio.charset.StandardCharsets; + +import static org.junit.Assert.assertArrayEquals; + +public class StringToByteArrayUnitTest { + @Test + public void whenGetBytes_thenCorrect() throws UnsupportedEncodingException { + byte[] byteArray1 = "abcd".getBytes(); + byte[] byteArray2 = "efgh".getBytes(StandardCharsets.US_ASCII); + byte[] byteArray3 = "ijkl".getBytes("UTF-8"); + byte[] expected1 = new byte[] { 97, 98, 99, 100 }; + byte[] expected2 = new byte[] { 101, 102, 103, 104 }; + byte[] expected3 = new byte[] { 105, 106, 107, 108 }; + + assertArrayEquals(expected1, byteArray1); + assertArrayEquals(expected2, byteArray2); + assertArrayEquals(expected3, byteArray3); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToCharArrayUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToCharArrayUnitTest.java new file mode 100644 index 0000000000..ffb8049331 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToCharArrayUnitTest.java @@ -0,0 +1,17 @@ +package com.ossez.interview; + +import org.junit.Test; + +import java.util.Arrays; + +import static org.junit.Assert.assertEquals; + +public class StringToCharArrayUnitTest { + @Test + public void whenConvertingStringToCharArray_thenConversionSuccessful() { + String beforeConvStr = "hello"; + char[] afterConvCharArr = { 'h', 'e', 'l', 'l', 'o' }; + + assertEquals(Arrays.equals(beforeConvStr.toCharArray(), afterConvCharArr), true); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToIntegerUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToIntegerUnitTest.java new file mode 100644 index 0000000000..02a8b6c977 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/interview/StringToIntegerUnitTest.java @@ -0,0 +1,17 @@ +package com.ossez.interview; + +import org.apache.commons.lang3.math.NumberUtils; +import org.junit.Test; + +import static org.assertj.core.api.Assertions.assertThat; + +public class StringToIntegerUnitTest { + @Test + public void givenString_whenParsingInt_shouldConvertToInt() { + String givenString = "42"; + + int result = Integer.parseInt(givenString); + + assertThat(result).isEqualTo(42); + } +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/localization/ICUFormatUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/localization/ICUFormatUnitTest.java new file mode 100644 index 0000000000..a63d7827d9 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/localization/ICUFormatUnitTest.java @@ -0,0 +1,72 @@ +package com.ossez.localization; + +import org.junit.Test; + +import java.util.Locale; + +import static org.junit.Assert.assertEquals; + +public class ICUFormatUnitTest { + + @Test + public void givenInUK_whenAliceSendsNothing_thenCorrectMessage() { + assertEquals("Alice has sent you no messages.", ICUFormat.getLabel(Locale.UK, new Object[] { "Alice", "female", 0 })); + } + + @Test + public void givenInUK_whenAliceSendsOneMessage_thenCorrectMessage() { + assertEquals("Alice has sent you a message.", ICUFormat.getLabel(Locale.UK, new Object[] { "Alice", "female", 1 })); + } + + @Test + public void givenInUK_whenBobSendsSixMessages_thenCorrectMessage() { + assertEquals("Bob has sent you 6 messages.", ICUFormat.getLabel(Locale.UK, new Object[] { "Bob", "male", 6 })); + } + + @Test + public void givenInItaly_whenAliceSendsNothing_thenCorrectMessage() { + assertEquals("Alice non ti ha inviato nessun messaggio.", ICUFormat.getLabel(Locale.ITALY, new Object[] { "Alice", "female", 0 })); + } + + @Test + public void givenInItaly_whenAliceSendsOneMessage_thenCorrectMessage() { + assertEquals("Alice ti ha inviato un messaggio.", ICUFormat.getLabel(Locale.ITALY, new Object[] { "Alice", "female", 1 })); + } + + @Test + public void givenInItaly_whenBobSendsSixMessages_thenCorrectMessage() { + assertEquals("Bob ti ha inviato 6 messaggi.", ICUFormat.getLabel(Locale.ITALY, new Object[] { "Bob", "male", 6 })); + } + + @Test + public void givenInFrance_whenAliceSendsNothing_thenCorrectMessage() { + assertEquals("Alice ne vous a envoyé aucun message.", ICUFormat.getLabel(Locale.FRANCE, new Object[] { "Alice", "female", 0 })); + } + + @Test + public void givenInFrance_whenAliceSendsOneMessage_thenCorrectMessage() { + assertEquals("Alice vous a envoyé un message.", ICUFormat.getLabel(Locale.FRANCE, new Object[] { "Alice", "female", 1 })); + } + + @Test + public void givenInFrance_whenBobSendsSixMessages_thenCorrectMessage() { + assertEquals("Bob vous a envoyé 6 messages.", ICUFormat.getLabel(Locale.FRANCE, new Object[] { "Bob", "male", 6 })); + } + + + @Test + public void givenInPoland_whenAliceSendsNothing_thenCorrectMessage() { + assertEquals("Alice nie wysłała ci żadnej wiadomości.", ICUFormat.getLabel(Locale.forLanguageTag("pl-PL"), new Object[] { "Alice", "female", 0 })); + } + + @Test + public void givenInPoland_whenAliceSendsOneMessage_thenCorrectMessage() { + assertEquals("Alice wysłała ci wiadomość.", ICUFormat.getLabel(Locale.forLanguageTag("pl-PL"), new Object[] { "Alice", "female", 1 })); + } + + @Test + public void givenInPoland_whenBobSendsSixMessages_thenCorrectMessage() { + assertEquals("Bob wysłał ci 6 wiadomości.", ICUFormat.getLabel(Locale.forLanguageTag("pl-PL"), new Object[] { "Bob", "male", 6 })); + } + +} diff --git a/core-java-modules/core-java-numbers/src/test/java/com/ossez/randomstrings/RandomStringsUnitTest.java b/core-java-modules/core-java-numbers/src/test/java/com/ossez/randomstrings/RandomStringsUnitTest.java new file mode 100644 index 0000000000..98cdef16d6 --- /dev/null +++ b/core-java-modules/core-java-numbers/src/test/java/com/ossez/randomstrings/RandomStringsUnitTest.java @@ -0,0 +1,103 @@ +package com.ossez.randomstrings; + +import org.apache.commons.lang3.RandomStringUtils; +import org.junit.Test; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.nio.charset.Charset; +import java.util.Random; + +public class RandomStringsUnitTest { + + private static final Logger LOG = LoggerFactory.getLogger(RandomStringsUnitTest.class); + + @Test + public void givenUsingPlainJava_whenGeneratingRandomStringUnbounded_thenCorrect() { + byte[] array = new byte[7]; // length is bounded by 7 + new Random().nextBytes(array); + String generatedString = new String(array, Charset.forName("UTF-8")); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingPlainJava_whenGeneratingRandomStringBounded_thenCorrect() { + int leftLimit = 97; // letter 'a' + int rightLimit = 122; // letter 'z' + int targetStringLength = 10; + Random random = new Random(); + StringBuilder buffer = new StringBuilder(targetStringLength); + + for (int i = 0; i < targetStringLength; i++) { + int randomLimitedInt = leftLimit + (int) (random.nextFloat() * (rightLimit - leftLimit + 1)); + buffer.append((char) randomLimitedInt); + } + String generatedString = buffer.toString(); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingJava8_whenGeneratingRandomAlphabeticString_thenCorrect() { + int leftLimit = 97; // letter 'a' + int rightLimit = 122; // letter 'z' + int targetStringLength = 10; + Random random = new Random(); + + String generatedString = random.ints(leftLimit, rightLimit + 1) + .limit(targetStringLength) + .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append) + .toString(); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingJava8_whenGeneratingRandomAlphanumericString_thenCorrect() { + int leftLimit = 48; // numeral '0' + int rightLimit = 122; // letter 'z' + int targetStringLength = 10; + Random random = new Random(); + + String generatedString = random.ints(leftLimit, rightLimit + 1) + .filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97)) + .limit(targetStringLength) + .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append) + .toString(); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingApache_whenGeneratingRandomString_thenCorrect() { + String generatedString = RandomStringUtils.random(10); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingApache_whenGeneratingRandomAlphabeticString_thenCorrect() { + String generatedString = RandomStringUtils.randomAlphabetic(10); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingApache_whenGeneratingRandomAlphanumericString_thenCorrect() { + String generatedString = RandomStringUtils.randomAlphanumeric(10); + + LOG.debug(generatedString); + } + + @Test + public void givenUsingApache_whenGeneratingRandomStringBounded_thenCorrect() { + int length = 10; + boolean useLetters = true; + boolean useNumbers = false; + String generatedString = RandomStringUtils.random(length, useLetters, useNumbers); + + LOG.debug(generatedString); + } + +} diff --git a/core-java-modules/core-java-streams-2/README.md b/core-java-modules/core-java-streams-2/README.md new file mode 100644 index 0000000000..2ff95045c3 --- /dev/null +++ b/core-java-modules/core-java-streams-2/README.md @@ -0,0 +1,16 @@ +## Core Java streams + +This module contains articles about the Stream API in Java. + +### Relevant Articles: +- [The Java 8 Stream API Tutorial](https://www.baeldung.com/java-8-streams) +- [Introduction to Java 8 Streams](https://www.baeldung.com/java-8-streams-introduction) +- [Java 8 Stream findFirst() vs. findAny()](https://www.baeldung.com/java-stream-findfirst-vs-findany) +- [Guide to Stream.reduce()](https://www.baeldung.com/java-stream-reduce) +- [Java IntStream Conversions](https://www.baeldung.com/java-intstream-convert) +- [Java 8 Streams peek() API](https://www.baeldung.com/java-streams-peek-api) +- [Working With Maps Using Streams](https://www.baeldung.com/java-maps-streams) +- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection) +- [How to Add a Single Element to a Stream](https://www.baeldung.com/java-stream-append-prepend) +- [Operating on and Removing an Item from Stream](https://www.baeldung.com/java-use-remove-item-stream) +- More articles: [[<-- prev>]](/../core-java-streams) [[next -->]](/../core-java-streams-3) diff --git a/core-java-modules/core-java-streams-2/pom.xml b/core-java-modules/core-java-streams-2/pom.xml new file mode 100644 index 0000000000..c8fa83c55a --- /dev/null +++ b/core-java-modules/core-java-streams-2/pom.xml @@ -0,0 +1,40 @@ + + + 4.0.0 + core-java-streams-2 + 1.0 + core-java-streams-2 + jar + + + com.baeldung.core-java-modules + core-java-modules + 0.0.1-SNAPSHOT + + + + + org.openjdk.jmh + jmh-core + ${jmh-core.version} + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator.version} + + + log4j + log4j + ${log4j.version} + + + + + 1.9 + 1.9 + + + \ No newline at end of file diff --git a/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java new file mode 100644 index 0000000000..62d080c32c --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java @@ -0,0 +1,39 @@ +package com.baeldung.reduce.application; + +import com.baeldung.reduce.entities.User; +import com.baeldung.reduce.utilities.NumberUtils; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; + +public class Application { + + public static void main(String[] args) { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + int result1 = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); + System.out.println(result1); + + int result2 = numbers.stream().reduce(0, Integer::sum); + System.out.println(result2); + + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result3 = letters.stream().reduce("", (partialString, element) -> partialString + element); + System.out.println(result3); + + String result4 = letters.stream().reduce("", String::concat); + System.out.println(result4); + + String result5 = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); + System.out.println(result5); + + List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); + int result6 = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + System.out.println(result6); + + String result7 = letters.parallelStream().reduce("", String::concat); + System.out.println(result7); + + int result8 = users.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + System.out.println(result8); + } +} diff --git a/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java new file mode 100644 index 0000000000..ecb0347e96 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java @@ -0,0 +1,52 @@ +package com.baeldung.reduce.benchmarks; + +import com.baeldung.reduce.entities.User; +import java.util.ArrayList; +import java.util.List; +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.Scope; +import org.openjdk.jmh.annotations.State; +import org.openjdk.jmh.runner.Runner; +import org.openjdk.jmh.runner.RunnerException; +import org.openjdk.jmh.runner.options.Options; +import org.openjdk.jmh.runner.options.OptionsBuilder; + +@State(Scope.Thread) +@BenchmarkMode(Mode.AverageTime) +public class JMHStreamReduceBenchMark { + + private final List userList = createUsers(); + + public static void main(String[] args) throws RunnerException { + + Options options = new OptionsBuilder() + .include(JMHStreamReduceBenchMark.class.getSimpleName()).threads(1) + .forks(1).shouldFailOnError(true).shouldDoGC(true) + .jvmArgs("-server").build(); + new Runner(options).run(); + } + + private List createUsers() { + List users = new ArrayList<>(); + for (int i = 0; i <= 1000000; i++) { + users.add(new User("John" + i, i)); + } + return users; + } + + @Benchmark + public Integer executeReduceOnParallelizedStream() { + return this.userList + .parallelStream() + .reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + } + + @Benchmark + public Integer executeReduceOnSequentialStream() { + return this.userList + .stream() + .reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + } +} diff --git a/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java new file mode 100644 index 0000000000..6e0a529de6 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java @@ -0,0 +1,25 @@ +package com.baeldung.reduce.entities; + +public class User { + + private final String name; + private final int age; + + public User(String name, int age) { + this.name = name; + this.age = age; + } + + public String getName() { + return name; + } + + public int getAge() { + return age; + } + + @Override + public String toString() { + return "User{" + "name=" + name + ", age=" + age + '}'; + } +} diff --git a/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java new file mode 100644 index 0000000000..38d5b50120 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java @@ -0,0 +1,52 @@ +package com.baeldung.reduce.utilities; + +import java.util.List; +import java.util.function.BiFunction; +import java.util.logging.Level; +import java.util.logging.Logger; + +public abstract class NumberUtils { + + private static final Logger LOGGER = Logger.getLogger(NumberUtils.class.getName()); + + public static int divideListElements(List values, Integer divider) { + return values.stream() + .reduce(0, (a, b) -> { + try { + return a / divider + b / divider; + } catch (ArithmeticException e) { + LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); + } + return 0; + }); + } + + public static int divideListElementsWithExtractedTryCatchBlock(List values, int divider) { + return values.stream().reduce(0, (a, b) -> divide(a, divider) + divide(b, divider)); + } + + public static int divideListElementsWithApplyFunctionMethod(List values, int divider) { + BiFunction division = (a, b) -> a / b; + return values.stream().reduce(0, (a, b) -> applyFunction(division, a, divider) + applyFunction(division, b, divider)); + } + + private static int divide(int value, int factor) { + int result = 0; + try { + result = value / factor; + } catch (ArithmeticException e) { + LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); + } + return result; + } + + private static int applyFunction(BiFunction function, int a, int b) { + try { + return function.apply(a, b); + } + catch(Exception e) { + LOGGER.log(Level.INFO, "Exception thrown!"); + } + return 0; + } +} diff --git a/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java new file mode 100644 index 0000000000..6d515bfb46 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java @@ -0,0 +1,22 @@ +package com.baeldung.streams; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.function.Supplier; +import java.util.stream.Collector; + +public class MyImmutableListCollector { + + public static > Collector> toImmutableList(Supplier supplier) { + return Collector.of(supplier, List::add, (left, right) -> { + left.addAll(right); + return left; + }, Collections::unmodifiableList); + } + + public static Collector, List> toImmutableList() { + return toImmutableList(ArrayList::new); + } + +} diff --git a/core-java-modules/core-java-streams-2/src/main/resources/logback.xml b/core-java-modules/core-java-streams-2/src/main/resources/logback.xml new file mode 100644 index 0000000000..7d900d8ea8 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/main/resources/logback.xml @@ -0,0 +1,13 @@ + + + + + %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n + + + + + + + + \ No newline at end of file diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java new file mode 100644 index 0000000000..3f2fd1641e --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java @@ -0,0 +1,40 @@ +package com.baeldung.convert.intstreams; + +import org.junit.Test; + +import java.util.List; +import java.util.stream.Collectors; +import java.util.stream.IntStream; +import static org.assertj.core.api.Assertions.assertThat; + +public class IntStreamsConversionsUnitTest { + + @Test + public void intStreamToArray() { + int[] first50EvenNumbers = IntStream.iterate(0, i -> i + 2) + .limit(50) + .toArray(); + + assertThat(first50EvenNumbers).hasSize(50); + assertThat(first50EvenNumbers[2]).isEqualTo(4); + } + + @Test + public void intStreamToList() { + List first50IntegerNumbers = IntStream.range(0, 50) + .boxed() + .collect(Collectors.toList()); + + assertThat(first50IntegerNumbers).hasSize(50); + assertThat(first50IntegerNumbers.get(2)).isEqualTo(2); + } + + @Test + public void intStreamToString() { + String first3numbers = IntStream.of(0, 1, 2) + .mapToObj(String::valueOf) + .collect(Collectors.joining(", ", "[", "]")); + + assertThat(first3numbers).isEqualTo("[0, 1, 2]"); + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java new file mode 100644 index 0000000000..21eedf953e --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java @@ -0,0 +1,80 @@ +package com.baeldung.reduce; + +import com.baeldung.reduce.entities.User; +import com.baeldung.reduce.utilities.NumberUtils; +import org.junit.Test; + +import java.util.Arrays; +import java.util.List; + +import static org.assertj.core.api.Assertions.assertThat; + +public class StreamReduceUnitTest { + + @Test + public void givenIntegerList_whenReduceWithSumAccumulatorLambda_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + int result = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); + assertThat(result).isEqualTo(21); + } + + @Test + public void givenIntegerList_whenReduceWithSumAccumulatorMethodReference_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + int result = numbers.stream().reduce(0, Integer::sum); + assertThat(result).isEqualTo(21); + } + + @Test + public void givenStringList_whenReduceWithConcatenatorAccumulatorLambda_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.stream().reduce("", (partialString, element) -> partialString + element); + assertThat(result).isEqualTo("abcde"); + } + + @Test + public void givenStringList_whenReduceWithConcatenatorAccumulatorMethodReference_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.stream().reduce("", String::concat); + assertThat(result).isEqualTo("abcde"); + } + + @Test + public void givenStringList_whenReduceWithUppercaseConcatenatorAccumulator_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); + assertThat(result).isEqualTo("ABCDE"); + } + + @Test + public void givenUserList_whenReduceWithAgeAccumulatorAndSumCombiner_thenCorrect() { + List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); + int result = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + assertThat(result).isEqualTo(65); + } + + @Test + public void givenStringList_whenReduceWithParallelStream_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.parallelStream().reduce("", String::concat); + assertThat(result).isEqualTo("abcde"); + } + + @Test + public void givenNumberUtilsClass_whenCalledDivideListElements_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + assertThat(NumberUtils.divideListElements(numbers, 1)).isEqualTo(21); + } + + @Test + public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlock_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 1)).isEqualTo(21); + } + + @Test + public void givenStream_whneCalleddivideListElementsWithApplyFunctionMethod_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + assertThat(NumberUtils.divideListElementsWithApplyFunctionMethod(numbers, 1)).isEqualTo(21); + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java new file mode 100644 index 0000000000..d2f5774b24 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java @@ -0,0 +1,13 @@ +package com.baeldung.streams; + +import java.util.Arrays; +import java.util.List; + +public class Detail { + + private static final List PARTS = Arrays.asList("turbine", "pump"); + + public List getParts() { + return PARTS; + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java new file mode 100644 index 0000000000..934d7b3542 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java @@ -0,0 +1,46 @@ +package com.baeldung.streams; + +import org.junit.Test; + +import java.util.Arrays; +import java.util.List; +import java.util.Optional; + +import static org.hamcrest.Matchers.anyOf; +import static org.hamcrest.Matchers.is; +import static org.junit.Assert.assertThat; +import static org.junit.Assert.assertTrue; + +public class Java8FindAnyFindFirstUnitTest { + + @Test + public void createStream_whenFindAnyResultIsPresent_thenCorrect() { + + List list = Arrays.asList("A", "B", "C", "D"); + + Optional result = list.stream().findAny(); + + assertTrue(result.isPresent()); + assertThat(result.get(), anyOf(is("A"), is("B"), is("C"), is("D"))); + } + + @Test + public void createParallelStream_whenFindAnyResultIsPresent_thenCorrect() throws Exception { + List list = Arrays.asList(1, 2, 3, 4, 5); + Optional result = list.stream().parallel().filter(num -> num < 4).findAny(); + + assertTrue(result.isPresent()); + assertThat(result.get(), anyOf(is(1), is(2), is(3))); + } + + @Test + public void createStream_whenFindFirstResultIsPresent_thenCorrect() { + + List list = Arrays.asList("A", "B", "C", "D"); + + Optional result = list.stream().findFirst(); + + assertTrue(result.isPresent()); + assertThat(result.get(), is("A")); + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java new file mode 100644 index 0000000000..c4e1f2b3cb --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java @@ -0,0 +1,242 @@ +package com.baeldung.streams; + +import org.junit.Before; +import org.junit.Test; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.BufferedWriter; +import java.io.IOException; +import java.nio.charset.Charset; +import java.nio.file.Files; +import java.nio.file.Path; +import java.util.*; +import java.util.regex.Pattern; +import java.util.stream.*; + +import static org.junit.Assert.*; + +public class Java8StreamApiUnitTest { + + private long counter; + + private static Logger log = LoggerFactory.getLogger(Java8StreamApiUnitTest.class); + + private List productList; + + @Before + public void init() { + productList = Arrays.asList(new Product(23, "potatoes"), new Product(14, "orange"), new Product(13, "lemon"), new Product(23, "bread"), new Product(13, "sugar")); + } + + @Test + public void checkPipeline_whenStreamOneElementShorter_thenCorrect() { + + List list = Arrays.asList("abc1", "abc2", "abc3"); + long size = list.stream().skip(1).map(element -> element.substring(0, 3)).count(); + assertEquals(list.size() - 1, size); + } + + @Test + public void checkOrder_whenChangeQuantityOfMethodCalls_thenCorrect() { + + List list = Arrays.asList("abc1", "abc2", "abc3"); + + counter = 0; + long sizeFirst = list.stream().skip(2).map(element -> { + wasCalled(); + return element.substring(0, 3); + }).count(); + assertEquals(1, counter); + + counter = 0; + long sizeSecond = list.stream().map(element -> { + wasCalled(); + return element.substring(0, 3); + }).skip(2).count(); + assertEquals(3, counter); + } + + @Test + public void createEmptyStream_whenEmpty_thenCorrect() { + + Stream streamEmpty = Stream.empty(); + assertEquals(0, streamEmpty.count()); + + List names = Collections.emptyList(); + Stream streamOf = Product.streamOf(names); + assertTrue(streamOf.count() == 0); + } + + @Test + public void createStream_whenCreated_thenCorrect() { + + Collection collection = Arrays.asList("a", "b", "c"); + Stream streamOfCollection = collection.stream(); + assertEquals(3, streamOfCollection.count()); + + Stream streamOfArray = Stream.of("a", "b", "c"); + assertEquals(3, streamOfArray.count()); + + String[] arr = new String[] { "a", "b", "c" }; + Stream streamOfArrayPart = Arrays.stream(arr, 1, 3); + assertEquals(2, streamOfArrayPart.count()); + + IntStream intStream = IntStream.range(1, 3); + LongStream longStream = LongStream.rangeClosed(1, 3); + Random random = new Random(); + DoubleStream doubleStream = random.doubles(3); + assertEquals(2, intStream.count()); + assertEquals(3, longStream.count()); + assertEquals(3, doubleStream.count()); + + IntStream streamOfChars = "abc".chars(); + IntStream str = "".chars(); + assertEquals(3, streamOfChars.count()); + + Stream streamOfString = Pattern.compile(", ").splitAsStream("a, b, c"); + assertEquals("a", streamOfString.findFirst().get()); + + Path path = getPath(); + Stream streamOfStrings = null; + try { + streamOfStrings = Files.lines(path, Charset.forName("UTF-8")); + } catch (IOException e) { + log.error("Error creating streams from paths {}", path, e.getMessage(), e); + } + assertEquals("a", streamOfStrings.findFirst().get()); + + Stream streamBuilder = Stream. builder().add("a").add("b").add("c").build(); + assertEquals(3, streamBuilder.count()); + + Stream streamGenerated = Stream.generate(() -> "element").limit(10); + assertEquals(10, streamGenerated.count()); + + Stream streamIterated = Stream.iterate(40, n -> n + 2).limit(20); + assertTrue(40 <= streamIterated.findAny().get()); + } + + @Test + public void runStreamPipeline_whenOrderIsRight_thenCorrect() { + + List list = Arrays.asList("abc1", "abc2", "abc3"); + Optional stream = list.stream().filter(element -> { + log.info("filter() was called"); + return element.contains("2"); + }).map(element -> { + log.info("map() was called"); + return element.toUpperCase(); + }).findFirst(); + } + + @Test + public void reduce_whenExpected_thenCorrect() { + + OptionalInt reduced = IntStream.range(1, 4).reduce((a, b) -> a + b); + assertEquals(6, reduced.getAsInt()); + + int reducedTwoParams = IntStream.range(1, 4).reduce(10, (a, b) -> a + b); + assertEquals(16, reducedTwoParams); + + int reducedThreeParams = Stream.of(1, 2, 3).reduce(10, (a, b) -> a + b, (a, b) -> { + log.info("combiner was called"); + return a + b; + }); + assertEquals(16, reducedThreeParams); + + int reducedThreeParamsParallel = Arrays.asList(1, 2, 3).parallelStream().reduce(10, (a, b) -> a + b, (a, b) -> { + log.info("combiner was called"); + return a + b; + }); + assertEquals(36, reducedThreeParamsParallel); + } + + @Test + public void collecting_whenAsExpected_thenCorrect() { + + List collectorCollection = productList.stream().map(Product::getName).collect(Collectors.toList()); + + assertTrue(collectorCollection instanceof List); + assertEquals(5, collectorCollection.size()); + + String listToString = productList.stream().map(Product::getName).collect(Collectors.joining(", ", "[", "]")); + + assertTrue(listToString.contains(",") && listToString.contains("[") && listToString.contains("]")); + + double averagePrice = productList.stream().collect(Collectors.averagingInt(Product::getPrice)); + assertTrue(17.2 == averagePrice); + + int summingPrice = productList.stream().collect(Collectors.summingInt(Product::getPrice)); + assertEquals(86, summingPrice); + + IntSummaryStatistics statistics = productList.stream().collect(Collectors.summarizingInt(Product::getPrice)); + assertEquals(23, statistics.getMax()); + + Map> collectorMapOfLists = productList.stream().collect(Collectors.groupingBy(Product::getPrice)); + assertEquals(3, collectorMapOfLists.keySet().size()); + + Map> mapPartioned = productList.stream().collect(Collectors.partitioningBy(element -> element.getPrice() > 15)); + assertEquals(2, mapPartioned.keySet().size()); + + } + + @Test(expected = UnsupportedOperationException.class) + public void collect_whenThrows_thenCorrect() { + Set unmodifiableSet = productList.stream().collect(Collectors.collectingAndThen(Collectors.toSet(), Collections::unmodifiableSet)); + unmodifiableSet.add(new Product(4, "tea")); + } + + @Test + public void customCollector_whenResultContainsAllElementsFrSource_thenCorrect() { + Collector> toLinkedList = Collector.of(LinkedList::new, LinkedList::add, (first, second) -> { + first.addAll(second); + return first; + }); + + LinkedList linkedListOfPersons = productList.stream().collect(toLinkedList); + assertTrue(linkedListOfPersons.containsAll(productList)); + } + + @Test + public void parallelStream_whenWorks_thenCorrect() { + Stream streamOfCollection = productList.parallelStream(); + boolean isParallel = streamOfCollection.isParallel(); + boolean haveBigPrice = streamOfCollection.map(product -> product.getPrice() * 12).anyMatch(price -> price > 200); + assertTrue(isParallel && haveBigPrice); + } + + @Test + public void parallel_whenIsParallel_thenCorrect() { + IntStream intStreamParallel = IntStream.range(1, 150).parallel().map(element -> element * 34); + boolean isParallel = intStreamParallel.isParallel(); + assertTrue(isParallel); + } + + @Test + public void parallel_whenIsSequential_thenCorrect() { + IntStream intStreamParallel = IntStream.range(1, 150).parallel().map(element -> element * 34); + IntStream intStreamSequential = intStreamParallel.sequential(); + boolean isParallel = intStreamParallel.isParallel(); + assertFalse(isParallel); + } + + private Path getPath() { + Path path = null; + try { + path = Files.createTempFile(null, ".txt"); + } catch (IOException e) { + log.error(e.getMessage()); + } + + try (BufferedWriter writer = Files.newBufferedWriter(path)) { + writer.write("a\nb\nc"); + } catch (IOException e) { + log.error(e.getMessage()); + } + return path; + } + + private void wasCalled() { + counter++; + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java new file mode 100644 index 0000000000..f46fa79b08 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java @@ -0,0 +1,104 @@ +package com.baeldung.streams; + +import org.junit.Before; +import org.junit.Test; + +import java.nio.file.Path; +import java.nio.file.Paths; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import static org.junit.Assert.*; + +public class Java8StreamsUnitTest { + + private List list; + + @Before + public void init() { + list = new ArrayList<>(); + list.add("One"); + list.add("OneAndOnly"); + list.add("Derek"); + list.add("Change"); + list.add("factory"); + list.add("justBefore"); + list.add("Italy"); + list.add("Italy"); + list.add("Thursday"); + list.add(""); + list.add(""); + } + + @Test + public void checkStreamCount_whenCreating_givenDifferentSources() { + String[] arr = new String[] { "a", "b", "c" }; + Stream streamArr = Arrays.stream(arr); + assertEquals(streamArr.count(), 3); + + Stream streamOf = Stream.of("a", "b", "c"); + assertEquals(streamOf.count(), 3); + + long count = list.stream().distinct().count(); + assertEquals(count, 9); + } + + @Test + public void checkStreamCount_whenOperationFilter_thanCorrect() { + Stream streamFilter = list.stream().filter(element -> element.isEmpty()); + assertEquals(streamFilter.count(), 2); + } + + @Test + public void checkStreamCount_whenOperationMap_thanCorrect() { + List uris = new ArrayList<>(); + uris.add("C:\\My.txt"); + Stream streamMap = uris.stream().map(uri -> Paths.get(uri)); + assertEquals(streamMap.count(), 1); + + List details = new ArrayList<>(); + details.add(new Detail()); + details.add(new Detail()); + Stream streamFlatMap = details.stream().flatMap(detail -> detail.getParts().stream()); + assertEquals(streamFlatMap.count(), 4); + } + + @Test + public void checkStreamCount_whenOperationMatch_thenCorrect() { + boolean isValid = list.stream().anyMatch(element -> element.contains("h")); + boolean isValidOne = list.stream().allMatch(element -> element.contains("h")); + boolean isValidTwo = list.stream().noneMatch(element -> element.contains("h")); + assertTrue(isValid); + assertFalse(isValidOne); + assertFalse(isValidTwo); + } + + @Test + public void checkStreamReducedValue_whenOperationReduce_thenCorrect() { + List integers = new ArrayList<>(); + integers.add(1); + integers.add(1); + integers.add(1); + Integer reduced = integers.stream().reduce(23, (a, b) -> a + b); + assertTrue(reduced == 26); + } + + @Test + public void checkStreamContains_whenOperationCollect_thenCorrect() { + List resultList = list.stream().map(element -> element.toUpperCase()).collect(Collectors.toList()); + assertEquals(resultList.size(), list.size()); + assertTrue(resultList.contains("")); + } + + @Test + public void checkParallelStream_whenDoWork() { + list.parallelStream().forEach(element -> doWork(element)); + } + + private void doWork(String string) { + assertTrue(true); // just imitate an amount of work + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java new file mode 100644 index 0000000000..97af4149d3 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java @@ -0,0 +1,118 @@ +package com.baeldung.streams; + +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; + +import java.io.StringWriter; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import static org.assertj.core.api.Assertions.assertThat; + +public class PeekUnitTest { + + private StringWriter out; + + @BeforeEach + void setup() { + out = new StringWriter(); + } + + @Test + void givenStringStream_whenCallingPeekOnly_thenNoElementProcessed() { + // given + Stream nameStream = Stream.of("Alice", "Bob", "Chuck"); + + // when + nameStream.peek(out::append); + + // then + assertThat(out.toString()).isEmpty(); + } + + @Test + void givenStringStream_whenCallingForEachOnly_thenElementsProcessed() { + // given + Stream nameStream = Stream.of("Alice", "Bob", "Chuck"); + + // when + nameStream.forEach(out::append); + + // then + assertThat(out.toString()).isEqualTo("AliceBobChuck"); + } + + @Test + void givenStringStream_whenCallingPeekAndNoopForEach_thenElementsProcessed() { + // given + Stream nameStream = Stream.of("Alice", "Bob", "Chuck"); + + // when + nameStream.peek(out::append) + .forEach(this::noop); + + // then + assertThat(out.toString()).isEqualTo("AliceBobChuck"); + } + + @Test + void givenStringStream_whenCallingPeekAndCollect_thenElementsProcessed() { + // given + Stream nameStream = Stream.of("Alice", "Bob", "Chuck"); + + // when + nameStream.peek(out::append) + .collect(Collectors.toList()); + + // then + assertThat(out.toString()).isEqualTo("AliceBobChuck"); + } + + @Test + void givenStringStream_whenCallingPeekAndForEach_thenElementsProcessedTwice() { + // given + Stream nameStream = Stream.of("Alice", "Bob", "Chuck"); + + // when + nameStream.peek(out::append) + .forEach(out::append); + + // then + assertThat(out.toString()).isEqualTo("AliceAliceBobBobChuckChuck"); + } + + @Test + void givenStringStream_whenCallingPeek_thenElementsProcessedTwice() { + // given + Stream userStream = Stream.of(new User("Alice"), new User("Bob"), new User("Chuck")); + + // when + userStream.peek(u -> u.setName(u.getName().toLowerCase())) + .map(User::getName) + .forEach(out::append); + + // then + assertThat(out.toString()).isEqualTo("alicebobchuck"); + } + + private static class User { + private String name; + + public User(String name) { + this.name = name; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + } + + private void noop(String s) { + } + +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java new file mode 100644 index 0000000000..7883f055a1 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java @@ -0,0 +1,48 @@ +package com.baeldung.streams; + +import java.util.List; +import java.util.stream.Stream; + +/** + * Created by Alex Vengr + */ +public class Product { + + private int price; + + private String name; + + private boolean utilize; + + public Product(int price, String name) { + this(price); + this.name = name; + } + + public Product(int price) { + this.price = price; + } + + public Product() { + } + + public int getPrice() { + return price; + } + + public void setPrice(int price) { + this.price = price; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + public static Stream streamOf(List list) { + return (list == null || list.isEmpty()) ? Stream.empty() : list.stream(); + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java new file mode 100644 index 0000000000..1fada26de5 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java @@ -0,0 +1,48 @@ +package com.baeldung.streams; + +import org.junit.Test; + +import java.util.List; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import static org.junit.Assert.assertEquals; + +public class StreamAddUnitTest { + + @Test + public void givenStream_whenAppendingObject_thenAppended() { + Stream anStream = Stream.of("a", "b", "c", "d", "e"); + + Stream newStream = Stream.concat(anStream, Stream.of("A")); + + List resultList = newStream.collect(Collectors.toList()); + assertEquals(resultList.get(resultList.size() - 1), "A"); + } + + @Test + public void givenStream_whenPrependingObject_thenPrepended() { + Stream anStream = Stream.of(1, 2, 3, 4, 5); + + Stream newStream = Stream.concat(Stream.of(99), anStream); + + assertEquals(newStream.findFirst() + .get(), (Integer) 99); + } + + @Test + public void givenStream_whenInsertingObject_thenInserted() { + Stream anStream = Stream.of(1.1, 2.2, 3.3); + + Stream newStream = insertInStream(anStream, 9.9, 3); + + List resultList = newStream.collect(Collectors.toList()); + assertEquals(resultList.get(3), (Double) 9.9); + } + + private Stream insertInStream(Stream stream, T elem, int index) { + List result = stream.collect(Collectors.toList()); + result.add(index, elem); + return result.stream(); + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java new file mode 100644 index 0000000000..509a3a3569 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java @@ -0,0 +1,80 @@ +package com.baeldung.streams; + +import org.junit.Before; +import org.junit.Test; + +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.stream.Collectors; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +public class StreamMapUnitTest { + + private Map books; + + @Before + public void setup() { + books = new HashMap<>(); + books.put("978-0201633610", "Design patterns : elements of reusable object-oriented software"); + books.put("978-1617291999", "Java 8 in Action: Lambdas, Streams, and functional-style programming"); + books.put("978-0134685991", "Effective Java"); + } + + + @Test + public void whenOptionalVersionCalledForExistingTitle_thenReturnOptionalWithISBN() { + Optional optionalIsbn = books.entrySet().stream() + .filter(e -> "Effective Java".equals(e.getValue())) + .map(Map.Entry::getKey).findFirst(); + + assertEquals("978-0134685991", optionalIsbn.get()); + } + + @Test + public void whenOptionalVersionCalledForNonExistingTitle_thenReturnEmptyOptionalForISBN() { + Optional optionalIsbn = books.entrySet().stream() + .filter(e -> "Non Existent Title".equals(e.getValue())) + .map(Map.Entry::getKey).findFirst(); + + assertEquals(false, optionalIsbn.isPresent()); + } + + @Test + public void whenMultipleResultsVersionCalledForExistingTitle_aCollectionWithMultipleValuesIsReturned() { + books.put("978-0321356680", "Effective Java: Second Edition"); + + List isbnCodes = books.entrySet().stream() + .filter(e -> e.getValue().startsWith("Effective Java")) + .map(Map.Entry::getKey) + .collect(Collectors.toList()); + + assertTrue(isbnCodes.contains("978-0321356680")); + assertTrue(isbnCodes.contains("978-0134685991")); + } + + @Test + public void whenMultipleResultsVersionCalledForNonExistingTitle_aCollectionWithNoValuesIsReturned() { + List isbnCodes = books.entrySet().stream() + .filter(e -> e.getValue().startsWith("Spring")) + .map(Map.Entry::getKey) + .collect(Collectors.toList()); + + assertTrue(isbnCodes.isEmpty()); + } + + @Test + public void whenKeysFollowingPatternReturnsAllValuesForThoseKeys() { + List titlesForKeyPattern = books.entrySet().stream() + .filter(e -> e.getKey().startsWith("978-0")) + .map(Map.Entry::getValue) + .collect(Collectors.toList()); + assertEquals(2, titlesForKeyPattern.size()); + assertTrue(titlesForKeyPattern.contains("Design patterns : elements of reusable object-oriented software")); + assertTrue(titlesForKeyPattern.contains("Effective Java")); + } + +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java new file mode 100644 index 0000000000..e5339d8327 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java @@ -0,0 +1,57 @@ +package com.baeldung.streams; + +import com.google.common.collect.ImmutableList; +import org.junit.Test; + +import java.util.*; +import java.util.stream.IntStream; + +import static java.util.stream.Collectors.*; + +public class StreamToImmutableUnitTest { + + @Test + public void whenUsingCollectingToImmutableSet_thenSuccess() { + List givenList = Arrays.asList("a", "b", "c"); + List result = givenList.stream() + .collect(collectingAndThen(toSet(), ImmutableList::copyOf)); + + System.out.println(result.getClass()); + } + + @Test + public void whenUsingCollectingToUnmodifiableList_thenSuccess() { + List givenList = new ArrayList<>(Arrays.asList("a", "b", "c")); + List result = givenList.stream() + .collect(collectingAndThen(toList(), Collections::unmodifiableList)); + + System.out.println(result.getClass()); + } + + @Test + public void whenCollectToImmutableList_thenSuccess() { + List list = IntStream.range(0, 9) + .boxed() + .collect(ImmutableList.toImmutableList()); + + System.out.println(list.getClass()); + } + + @Test + public void whenCollectToMyImmutableListCollector_thenSuccess() { + List givenList = Arrays.asList("a", "b", "c", "d"); + List result = givenList.stream() + .collect(MyImmutableListCollector.toImmutableList()); + + System.out.println(result.getClass()); + } + + @Test + public void whenPassingSupplier_thenSuccess() { + List givenList = Arrays.asList("a", "b", "c", "d"); + List result = givenList.stream() + .collect(MyImmutableListCollector.toImmutableList(LinkedList::new)); + + System.out.println(result.getClass()); + } +} diff --git a/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java new file mode 100644 index 0000000000..194d0bd4d6 --- /dev/null +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java @@ -0,0 +1,80 @@ +package com.baeldung.streams.removeitem; + +import org.junit.Assert; +import org.junit.Before; +import org.junit.Test; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; +import java.util.List; +import java.util.function.Predicate; +import java.util.stream.Collectors; + +public class StreamOperateAndRemoveUnitTest { + + private List itemList; + + @Before + public void setup() { + + itemList = new ArrayList<>(); + for (int i = 0; i < 10; i++) { + itemList.add(new Item(i)); + } + } + + @Test + public void givenAListOf10Items_whenFilteredForQualifiedItems_thenFilteredListContains5Items() { + + final List filteredList = itemList.stream().filter(item -> item.isQualified()) + .collect(Collectors.toList()); + + Assert.assertEquals(5, filteredList.size()); + } + + @Test + public void givenAListOf10Items_whenOperateAndRemoveQualifiedItemsUsingRemoveIf_thenListContains5Items() { + + final Predicate isQualified = item -> item.isQualified(); + itemList.stream().filter(isQualified).forEach(item -> item.operate()); + itemList.removeIf(isQualified); + + Assert.assertEquals(5, itemList.size()); + } + + @Test + public void givenAListOf10Items_whenOperateAndRemoveQualifiedItemsUsingRemoveAll_thenListContains5Items() { + + final List operatedList = new ArrayList<>(); + itemList.stream().filter(item -> item.isQualified()).forEach(item -> { + item.operate(); + operatedList.add(item); + }); + itemList.removeAll(operatedList); + + Assert.assertEquals(5, itemList.size()); + } + + class Item { + + private final Logger logger = LoggerFactory.getLogger(this.getClass().getName()); + + private final int value; + + public Item(final int value) { + + this.value = value; + } + + public boolean isQualified() { + + return value % 2 == 0; + } + + public void operate() { + + logger.info("Even Number: " + this.value); + } + } +} \ No newline at end of file diff --git a/core-java-modules/core-java-streams-3/README.md b/core-java-modules/core-java-streams-3/README.md new file mode 100644 index 0000000000..48ebf145d2 --- /dev/null +++ b/core-java-modules/core-java-streams-3/README.md @@ -0,0 +1,16 @@ +## Core Java streams + +This module contains articles about the Stream API in Java. + +### Relevant Articles: +- [The Difference Between map() and flatMap()](https://www.baeldung.com/java-difference-map-and-flatmap) +- [How to Use if/else Logic in Java 8 Streams](https://www.baeldung.com/java-8-streams-if-else-logic) +- [The Difference Between Collection.stream().forEach() and Collection.forEach()](https://www.baeldung.com/java-collection-stream-foreach) +- [Primitive Type Streams in Java 8](https://www.baeldung.com/java-8-primitive-streams) +- [Debugging Java 8 Streams with IntelliJ](https://www.baeldung.com/intellij-debugging-java-streams) +- [Add BigDecimals using the Stream API](https://www.baeldung.com/java-stream-add-bigdecimals) +- [Should We Close a Java Stream?](https://www.baeldung.com/java-stream-close) +- [Returning Stream vs. Collection](https://www.baeldung.com/java-return-stream-collection) +- [Convert a Java Enumeration Into a Stream](https://www.baeldung.com/java-enumeration-to-stream) +- [When to Use a Parallel Stream in Java](https://www.baeldung.com/java-when-to-use-parallel-stream) +- More articles: [[<-- prev>]](/../core-java-streams-2) diff --git a/core-java-modules/core-java-streams-3/pom.xml b/core-java-modules/core-java-streams-3/pom.xml new file mode 100644 index 0000000000..c2dfdc392b --- /dev/null +++ b/core-java-modules/core-java-streams-3/pom.xml @@ -0,0 +1,73 @@ + + + 4.0.0 + core-java-streams-3 + 0.1.0-SNAPSHOT + core-java-streams-3 + jar + + + com.baeldung.core-java-modules + core-java-modules + 0.0.1-SNAPSHOT + + + + + org.apache.commons + commons-lang3 + ${commons-lang3.version} + + + org.projectlombok + lombok + ${lombok.version} + provided + + + org.openjdk.jmh + jmh-core + ${jmh-core.version} + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator.version} + test + + + + + core-java-streams-3 + + + src/main/resources + true + + + + + org.apache.maven.plugins + maven-compiler-plugin + + 1.8 + 1.8 + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator.version} + + + + + + + + + 1.18.20 + + + \ No newline at end of file diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/closure/StreamClosureSnippets.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/closure/StreamClosureSnippets.java new file mode 100644 index 0000000000..10e5716e31 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/closure/StreamClosureSnippets.java @@ -0,0 +1,30 @@ +package com.baeldung.streams.closure; + +import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.Paths; +import java.util.Arrays; +import java.util.stream.Stream; + +/** + * Contains a couple of simple stream API usages. + */ +public class StreamClosureSnippets { + + public static void main(String[] args) throws IOException { + // Collection based streams shouldn't be closed + Arrays.asList("Red", "Blue", "Green") + .stream() + .filter(c -> c.length() > 4) + .map(String::toUpperCase) + .forEach(System.out::print); + + String[] colors = {"Red", "Blue", "Green"}; + Arrays.stream(colors).map(String::toUpperCase).forEach(System.out::println); + + // IO-Based Streams Should be Closed via Try with Resources + try (Stream lines = Files.lines(Paths.get("/path/tp/file"))) { + // lines will be closed after exiting the try block + } + } +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationSpliterator.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationSpliterator.java new file mode 100644 index 0000000000..5227fcb6c4 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationSpliterator.java @@ -0,0 +1,30 @@ +package com.baeldung.streams.conversion; + +import java.util.Enumeration; +import java.util.Spliterators.AbstractSpliterator; +import java.util.function.Consumer; + +public class EnumerationSpliterator extends AbstractSpliterator { + + private final Enumeration enumeration; + + public EnumerationSpliterator(long est, int additionalCharacteristics, Enumeration enumeration) { + super(est, additionalCharacteristics); + this.enumeration = enumeration; + } + + @Override + public boolean tryAdvance(Consumer action) { + if (enumeration.hasMoreElements()) { + action.accept(enumeration.nextElement()); + return true; + } + return false; + } + + @Override + public void forEachRemaining(Consumer action) { + while (enumeration.hasMoreElements()) + action.accept(enumeration.nextElement()); + } +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationStreamConversion.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationStreamConversion.java new file mode 100644 index 0000000000..cf041b9426 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/conversion/EnumerationStreamConversion.java @@ -0,0 +1,16 @@ +package com.baeldung.streams.conversion; + +import java.util.Enumeration; +import java.util.Spliterator; +import java.util.stream.Stream; +import java.util.stream.StreamSupport; + +public class EnumerationStreamConversion { + + public static Stream convert(Enumeration enumeration) { + EnumerationSpliterator spliterator = new EnumerationSpliterator(Long.MAX_VALUE, Spliterator.ORDERED, enumeration); + Stream stream = StreamSupport.stream(spliterator, false); + + return stream; + } +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/debug/entity/Customer.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/debug/entity/Customer.java new file mode 100644 index 0000000000..b8e1b6db5b --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/debug/entity/Customer.java @@ -0,0 +1,19 @@ +package com.baeldung.streams.debug.entity; + +public class Customer { + private final String name; + private final int age; + + public Customer(String name, int age) { + this.name = name; + this.age = age; + } + + public String getName() { + return name; + } + + public int getAge() { + return age; + } +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java new file mode 100644 index 0000000000..c4128d9b72 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java @@ -0,0 +1,84 @@ +package com.baeldung.streams.forEach; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Iterator; +import java.util.List; +import java.util.function.Consumer; + +class ReverseList extends ArrayList { + + List list = Arrays.asList("A", "B", "C", "D"); + + Consumer removeElement = s -> { + System.out.println(s + " " + list.size()); + if (s != null && s.equals("A")) { + list.remove("D"); + } + }; + + @Override + public Iterator iterator() { + + final int startIndex = this.size() - 1; + final List list = this; + return new Iterator() { + + int currentIndex = startIndex; + + @Override + public boolean hasNext() { + return currentIndex >= 0; + } + + @Override + public String next() { + String next = list.get(currentIndex); + currentIndex--; + return next; + } + + @Override + public void remove() { + throw new UnsupportedOperationException(); + } + }; + } + + public void forEach(Consumer action) { + for (String s : this) { + action.accept(s); + } + } + + public void iterateParallel() { + list.forEach(System.out::print); + System.out.print(" "); + list.parallelStream().forEach(System.out::print); + } + + public void iterateReverse() { + List myList = new ReverseList(); + myList.addAll(list); + myList.forEach(System.out::print); + System.out.print(" "); + myList.stream().forEach(System.out::print); + } + + public void removeInCollectionForEach() { + list.forEach(removeElement); + } + + public void removeInStreamForEach() { + list.stream().forEach(removeElement); + } + + public static void main(String[] argv) { + + ReverseList collectionForEach = new ReverseList(); + collectionForEach.iterateParallel(); + collectionForEach.iterateReverse(); + collectionForEach.removeInCollectionForEach(); + collectionForEach.removeInStreamForEach(); + } +} \ No newline at end of file diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/BenchmarkRunner.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/BenchmarkRunner.java new file mode 100644 index 0000000000..461d728ad0 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/BenchmarkRunner.java @@ -0,0 +1,9 @@ +package com.baeldung.streams.parallel; + +public class BenchmarkRunner { + + public static void main(String[] args) throws Exception { + org.openjdk.jmh.Main.main(args); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/DifferentSourceSplitting.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/DifferentSourceSplitting.java new file mode 100644 index 0000000000..9ad569df30 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/DifferentSourceSplitting.java @@ -0,0 +1,54 @@ +package com.baeldung.streams.parallel; + +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.OutputTimeUnit; + +import java.util.ArrayList; +import java.util.LinkedList; +import java.util.List; +import java.util.concurrent.TimeUnit; +import java.util.stream.IntStream; + +public class DifferentSourceSplitting { + + private static final List arrayListOfNumbers = new ArrayList<>(); + private static final List linkedListOfNumbers = new LinkedList<>(); + + static { + IntStream.rangeClosed(1, 1_000_000).forEach(i -> { + arrayListOfNumbers.add(i); + linkedListOfNumbers.add(i); + }); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void differentSourceArrayListSequential() { + arrayListOfNumbers.stream().reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void differentSourceArrayListParallel() { + arrayListOfNumbers.parallelStream().reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void differentSourceLinkedListSequential() { + linkedListOfNumbers.stream().reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void differentSourceLinkedListParallel() { + linkedListOfNumbers.parallelStream().reduce(0, Integer::sum); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MemoryLocalityCosts.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MemoryLocalityCosts.java new file mode 100644 index 0000000000..bc5cbf491b --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MemoryLocalityCosts.java @@ -0,0 +1,52 @@ +package com.baeldung.streams.parallel; + +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.OutputTimeUnit; + +import java.util.Arrays; +import java.util.concurrent.TimeUnit; +import java.util.stream.IntStream; + +public class MemoryLocalityCosts { + + private static final int[] intArray = new int[1_000_000]; + private static final Integer[] integerArray = new Integer[1_000_000]; + + static { + IntStream.rangeClosed(1, 1_000_000).forEach(i -> { + intArray[i-1] = i; + integerArray[i-1] = i; + }); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void localityIntArraySequential() { + Arrays.stream(intArray).reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void localityIntArrayParallel() { + Arrays.stream(intArray).parallel().reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void localityIntegerArraySequential() { + Arrays.stream(integerArray).reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void localityIntegerArrayParallel() { + Arrays.stream(integerArray).parallel().reduce(0, Integer::sum); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MergingCosts.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MergingCosts.java new file mode 100644 index 0000000000..a9919dbe72 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/MergingCosts.java @@ -0,0 +1,52 @@ +package com.baeldung.streams.parallel; + +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.OutputTimeUnit; + +import java.util.ArrayList; +import java.util.List; +import java.util.concurrent.TimeUnit; +import java.util.stream.Collectors; +import java.util.stream.IntStream; + +public class MergingCosts { + + private static final List arrayListOfNumbers = new ArrayList<>(); + + static { + IntStream.rangeClosed(1, 1_000_000).forEach(i -> { + arrayListOfNumbers.add(i); + }); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void mergingCostsSumSequential() { + arrayListOfNumbers.stream().reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void mergingCostsSumParallel() { + arrayListOfNumbers.stream().parallel().reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void mergingCostsGroupingSequential() { + arrayListOfNumbers.stream().collect(Collectors.toSet()); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void mergingCostsGroupingParallel() { + arrayListOfNumbers.stream().parallel().collect(Collectors.toSet()); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/ParallelStream.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/ParallelStream.java new file mode 100644 index 0000000000..f236f418e8 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/ParallelStream.java @@ -0,0 +1,15 @@ +package com.baeldung.streams.parallel; + +import java.util.Arrays; +import java.util.List; + +public class ParallelStream { + + public static void main(String[] args) { + List listOfNumbers = Arrays.asList(1, 2, 3, 4); + listOfNumbers.parallelStream().forEach(number -> + System.out.println(number + " " + Thread.currentThread().getName()) + ); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SequentialStream.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SequentialStream.java new file mode 100644 index 0000000000..01379130fa --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SequentialStream.java @@ -0,0 +1,15 @@ +package com.baeldung.streams.parallel; + +import java.util.Arrays; +import java.util.List; + +public class SequentialStream { + + public static void main(String[] args) { + List listOfNumbers = Arrays.asList(1, 2, 3, 4); + listOfNumbers.stream().forEach(number -> + System.out.println(number + " " + Thread.currentThread().getName()) + ); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SplittingCosts.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SplittingCosts.java new file mode 100644 index 0000000000..d1e878df1f --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/SplittingCosts.java @@ -0,0 +1,27 @@ +package com.baeldung.streams.parallel; + +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.OutputTimeUnit; + +import java.util.concurrent.TimeUnit; +import java.util.stream.IntStream; + +public class SplittingCosts { + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void sourceSplittingIntStreamSequential() { + IntStream.rangeClosed(1, 100).reduce(0, Integer::sum); + } + + @Benchmark + @BenchmarkMode(Mode.AverageTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public static void sourceSplittingIntStreamParallel() { + IntStream.rangeClosed(1, 100).parallel().reduce(0, Integer::sum); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java new file mode 100644 index 0000000000..fb2001f10f --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java @@ -0,0 +1,23 @@ +package com.baeldung.streams.primitivestreams; + +import java.util.Arrays; +import java.util.stream.IntStream; + +class PrimitiveStreams { + + int min(int[] integers) { + return Arrays.stream(integers).min().getAsInt(); + } + + int max(int... integers) { + return IntStream.of(integers).max().getAsInt(); + } + + int sum(int... integers) { + return IntStream.of(integers).sum(); + } + + double avg(int... integers) { + return IntStream.of(integers).average().getAsDouble(); + } +} diff --git a/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/streamvscollection/StreamVsCollectionExample.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/streamvscollection/StreamVsCollectionExample.java new file mode 100644 index 0000000000..379d231bed --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/streamvscollection/StreamVsCollectionExample.java @@ -0,0 +1,95 @@ +package com.baeldung.streams.streamvscollection; + +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamVsCollectionExample { + + static ArrayList userNameSource = new ArrayList<>(); + + static { + userNameSource.add("john"); + userNameSource.add("smith"); + userNameSource.add("tom"); + userNameSource.add("rob"); + userNameSource.add("charlie"); + userNameSource.add("alfred"); + } + + public static Stream userNames() { + return userNameSource.stream(); + } + + public static List userNameList() { + return userNames().collect(Collectors.toList()); + } + + public static Set userNameSet() { + return userNames().collect(Collectors.toSet()); + } + + public static Map userNameMap() { + return userNames().collect(Collectors.toMap(u1 -> u1.toString(), u1 -> u1.toString())); + } + + public static Stream filterUserNames() { + return userNames().filter(i -> i.length() >= 4); + } + + public static Stream sortUserNames() { + return userNames().sorted(); + } + + public static Stream limitUserNames() { + return userNames().limit(3); + } + + public static Stream sortFilterLimitUserNames() { + return filterUserNames().sorted().limit(3); + } + + public static void printStream(Stream stream) { + stream.forEach(System.out::println); + } + + public static void modifyList() { + userNameSource.remove(2); + } + + public static Map modifyMap() { + Map userNameMap = userNameMap(); + userNameMap.put("bob", "bob"); + userNameMap.remove("alfred"); + + return userNameMap; + } + + public static void tryStreamTraversal() { + Stream userNameStream = userNames(); + userNameStream.forEach(System.out::println); + + try { + userNameStream.forEach(System.out::println); + } catch(IllegalStateException e) { + System.out.println("stream has already been operated upon or closed"); + } + } + + public static void main(String[] args) { + System.out.println(userNameMap()); + System.out.println(modifyMap()); + tryStreamTraversal(); + + Set set = userNames().collect(Collectors.toCollection(TreeSet::new)); + set.forEach(val -> System.out.println(val)); + + } + + +} diff --git a/core-java-modules/core-java-streams-3/src/main/resources/logback.xml b/core-java-modules/core-java-streams-3/src/main/resources/logback.xml new file mode 100644 index 0000000000..7d900d8ea8 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/resources/logback.xml @@ -0,0 +1,13 @@ + + + + + %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n + + + + + + + + \ No newline at end of file diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/bigdecimals/AddNumbersUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/bigdecimals/AddNumbersUnitTest.java new file mode 100644 index 0000000000..9399908b30 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/bigdecimals/AddNumbersUnitTest.java @@ -0,0 +1,42 @@ +package com.baeldung.streams.bigdecimals; + +import static org.junit.Assert.assertEquals; + +import java.math.BigDecimal; +import java.util.Arrays; +import java.util.List; +import java.util.stream.IntStream; +import java.util.stream.Stream; + +import org.junit.Test; + +public class AddNumbersUnitTest { + + @Test + public void givenIntStream_whenSum_thenResultIsCorrect() { + IntStream intNumbers = IntStream.range(0, 3); + assertEquals(3, intNumbers.sum()); + } + + @Test + public void givenCollectionOfDouble_whenUsingMapToDoubleToSum_thenResultIsCorrect() { + List doubleNumbers = Arrays.asList(23.48, 52.26, 13.5); + double result = doubleNumbers.stream() + .mapToDouble(Double::doubleValue) + .sum(); + assertEquals(89.24, result, .1); + } + + public void givenStreamOfIntegers_whenUsingReduceToSum_thenResultIsCorrect() { + Stream intNumbers = Stream.of(0, 1, 2); + int result = intNumbers.reduce(0, Integer::sum); + assertEquals(106, result); + } + + public void givenStreamOfBigDecimals_whenUsingReduceToSum_thenResultIsCorrect() { + Stream bigDecimalNumber = Stream.of(BigDecimal.ZERO, BigDecimal.ONE, BigDecimal.TEN); + BigDecimal result = bigDecimalNumber.reduce(BigDecimal.ZERO, BigDecimal::add); + assertEquals(11, result); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java new file mode 100644 index 0000000000..a49a092864 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java @@ -0,0 +1,41 @@ +package com.baeldung.streams.conditional; + +import java.util.Arrays; +import java.util.List; +import java.util.stream.Stream; + +import org.junit.Assert; +import org.junit.Test; + +public class StreamForEachIfElseUnitTest { + + @Test + public final void givenIntegerStream_whenCheckingIntegerParityWithIfElse_thenEnsureCorrectParity() { + List ints = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); + + ints.stream() + .forEach(i -> { + if (i.intValue() % 2 == 0) { + Assert.assertTrue(i.intValue() + " is not even", i.intValue() % 2 == 0); + } else { + Assert.assertTrue(i.intValue() + " is not odd", i.intValue() % 2 != 0); + } + }); + + } + + @Test + public final void givenIntegerStream_whenCheckingIntegerParityWithStreamFilter_thenEnsureCorrectParity() { + List ints = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); + + Stream evenIntegers = ints.stream() + .filter(i -> i.intValue() % 2 == 0); + Stream oddIntegers = ints.stream() + .filter(i -> i.intValue() % 2 != 0); + + evenIntegers.forEach(i -> Assert.assertTrue(i.intValue() + " is not even", i.intValue() % 2 == 0)); + oddIntegers.forEach(i -> Assert.assertTrue(i.intValue() + " is not odd", i.intValue() % 2 != 0)); + + } + +} diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conversion/EnumerationStreamConversionUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conversion/EnumerationStreamConversionUnitTest.java new file mode 100644 index 0000000000..a075312fb5 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conversion/EnumerationStreamConversionUnitTest.java @@ -0,0 +1,35 @@ +package com.baeldung.streams.conversion; + +import static org.hamcrest.MatcherAssert.assertThat; +import static org.hamcrest.collection.IsIterableContainingInOrder.contains; + +import java.util.Arrays; +import java.util.List; +import java.util.Vector; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import org.junit.Assert; +import org.junit.jupiter.api.Test; + +public class EnumerationStreamConversionUnitTest { + + @Test + public void givenEnumeration_whenConvertedToStream_thenNotNull() { + Vector input = new Vector<>(Arrays.asList(1, 2, 3, 4, 5)); + + Stream resultingStream = EnumerationStreamConversion.convert(input.elements()); + + Assert.assertNotNull(resultingStream); + } + + @Test + public void whenConvertedToList_thenCorrect() { + Vector input = new Vector<>(Arrays.asList(1, 2, 3, 4, 5)); + + Stream stream = EnumerationStreamConversion.convert(input.elements()); + List list = stream.filter(e -> e >= 3) + .collect(Collectors.toList()); + assertThat(list, contains(3, 4, 5)); + } +} diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example1.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example1.java new file mode 100644 index 0000000000..d8087bc98a --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example1.java @@ -0,0 +1,18 @@ +package com.baeldung.streams.debug; + +import static org.assertj.core.api.Assertions.assertThat; + +import java.util.stream.IntStream; + +import org.junit.Test; + +public class Example1 { + @Test + public void whenDebugging_thenInformationIsShown() { + int[] listOutputSorted = IntStream.of(-3, 10, -4, 1, 3) + .sorted() + .toArray(); + + assertThat(listOutputSorted).isSorted(); + } +} diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example2.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example2.java new file mode 100644 index 0000000000..56cbddf0b4 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/debug/Example2.java @@ -0,0 +1,36 @@ +package com.baeldung.streams.debug; + +import static org.assertj.core.api.Assertions.assertThat; + +import java.util.Arrays; +import java.util.List; +import java.util.Optional; +import java.util.stream.Stream; + +import org.junit.Test; + +import com.baeldung.streams.debug.entity.Customer; + +public class Example2 { + @Test + public void whenDebugging_thenInformationIsShown() { + List> customers = Arrays.asList( + Optional.of(new Customer("John P.", 15)), + Optional.of(new Customer("Sarah M.", 78)), + Optional.empty(), + Optional.of(new Customer("Mary T.", 20)), + Optional.empty(), + Optional.of(new Customer("Florian G.", 89)), + Optional.empty() + ); + + long numberOf65PlusCustomers = customers.stream() + .flatMap(c -> c.map(Stream::of) + .orElseGet(Stream::empty)) + .mapToInt(Customer::getAge) + .filter(c -> c > 65) + .count(); + + assertThat(numberOf65PlusCustomers).isEqualTo(2); + } +} diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/parallel/ForkJoinUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/parallel/ForkJoinUnitTest.java new file mode 100644 index 0000000000..f9aab8ed6c --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/parallel/ForkJoinUnitTest.java @@ -0,0 +1,46 @@ +package com.baeldung.streams.parallel; + +import org.junit.jupiter.api.Test; + +import java.util.Arrays; +import java.util.List; +import java.util.concurrent.ExecutionException; +import java.util.concurrent.ForkJoinPool; + +import static org.assertj.core.api.Assertions.assertThat; + +class ForkJoinUnitTest { + + @Test + void givenSequentialStreamOfNumbers_whenReducingSumWithIdentityFive_thenResultIsCorrect() { + List listOfNumbers = Arrays.asList(1, 2, 3, 4); + int sum = listOfNumbers.stream().reduce(5, Integer::sum); + assertThat(sum).isEqualTo(15); + } + + @Test + void givenParallelStreamOfNumbers_whenReducingSumWithIdentityFive_thenResultIsNotCorrect() { + List listOfNumbers = Arrays.asList(1, 2, 3, 4); + int sum = listOfNumbers.parallelStream().reduce(5, Integer::sum); + assertThat(sum).isNotEqualTo(15); + } + + @Test + void givenParallelStreamOfNumbers_whenReducingSumWithIdentityZero_thenResultIsCorrect() { + List listOfNumbers = Arrays.asList(1, 2, 3, 4); + int sum = listOfNumbers.parallelStream().reduce(0, Integer::sum) + 5; + assertThat(sum).isEqualTo(15); + } + + @Test + public void givenParallelStreamOfNumbers_whenUsingCustomThreadPool_thenResultIsCorrect() + throws InterruptedException, ExecutionException { + List listOfNumbers = Arrays.asList(1, 2, 3, 4); + ForkJoinPool customThreadPool = new ForkJoinPool(4); + int sum = customThreadPool.submit( + () -> listOfNumbers.parallelStream().reduce(0, Integer::sum)).get(); + customThreadPool.shutdown(); + assertThat(sum).isEqualTo(10); + } + +} diff --git a/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java new file mode 100644 index 0000000000..18966425e4 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java @@ -0,0 +1,93 @@ +package com.baeldung.streams.primitivestreams; + +import org.junit.Test; + +import java.util.List; +import java.util.stream.Collectors; +import java.util.stream.IntStream; +import java.util.stream.Stream; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +public class PrimitiveStreamsUnitTest { + + private PrimitiveStreams streams = new PrimitiveStreams(); + + @Test + public void givenAnArrayOfIntegersWhenMinIsCalledThenCorrectMinIsReturned() { + int[] integers = new int[] { 20, 98, 12, 7, 35 }; + int min = streams.min(integers); // returns 7 + + assertEquals(7, min); + } + + @Test + public void givenAnArrayOfIntegersWhenMaxIsCalledThenCorrectMaxIsReturned() { + int max = streams.max(20, 98, 12, 7, 35); + + assertEquals(98, max); + } + + @Test + public void givenAnArrayOfIntegersWhenSumIsCalledThenCorrectSumIsReturned() { + int sum = streams.sum(20, 98, 12, 7, 35); + + assertEquals(172, sum); + } + + @Test + public void givenAnArrayOfIntegersWhenAvgIsCalledThenCorrectAvgIsReturned() { + double avg = streams.avg(20, 98, 12, 7, 35); + + assertTrue(34.4 == avg); + } + + @Test + public void givenARangeOfIntegersWhenIntStreamSumIsCalledThenCorrectSumIsReturned() { + int sum = IntStream.range(1, 10).sum(); + + assertEquals(45, sum); + } + + @Test + public void givenARangeClosedOfIntegersWhenIntStreamSumIsCalledThenCorrectSumIsReturned() { + int sum = IntStream.rangeClosed(1, 10).sum(); + + assertEquals(55, sum); + } + + @Test + public void givenARangeWhenForEachIsCalledThenTheIndicesWillBePrinted() { + IntStream.rangeClosed(1, 5).parallel().forEach(System.out::println); + } + + @Test + public void givenAnArrayWhenSumIsCalledThenTheCorrectSumIsReturned() { + + int sum = Stream.of(33, 45).mapToInt(i -> i).sum(); + + assertEquals(78, sum); + } + + @Test + public void givenAnIntStreamThenGetTheEvenIntegers() { + List evenInts = IntStream.rangeClosed(1, 10).filter(i -> i % 2 == 0).boxed().collect(Collectors.toList()); + + List expected = IntStream.of(2, 4, 6, 8, 10).boxed().collect(Collectors.toList()); + + assertEquals(expected, evenInts); + } + + class Person { + private int age; + + Person(int age) { + this.age = age; + } + + int getAge() { + return age; + } + } +} \ No newline at end of file diff --git a/core-java-modules/core-java-streams-4/README.md b/core-java-modules/core-java-streams-4/README.md new file mode 100644 index 0000000000..6eeee943aa --- /dev/null +++ b/core-java-modules/core-java-streams-4/README.md @@ -0,0 +1,3 @@ +## Relevant Articles: + +- [Count Occurrences Using Java groupingBy Collector](https://www.baeldung.com/java-groupingby-count) diff --git a/core-java-modules/core-java-streams-4/pom.xml b/core-java-modules/core-java-streams-4/pom.xml new file mode 100644 index 0000000000..110ec50b8c --- /dev/null +++ b/core-java-modules/core-java-streams-4/pom.xml @@ -0,0 +1,61 @@ + + + 4.0.0 + core-java-streams-4 + 0.1.0-SNAPSHOT + core-java-streams-4 + jar + + + com.baeldung.core-java-modules + core-java-modules + 0.0.1-SNAPSHOT + + + + + log4j + log4j + ${log4j.version} + + + org.junit + junit-bom + ${junit-jupiter.version} + pom + import + + + + + core-java-streams-4 + + + src/main + true + + + + + org.apache.maven.plugins + maven-compiler-plugin + ${maven-compiler-plugin.version} + + ${maven.compiler.source} + ${maven.compiler.target} + -parameters + + + + + + + + 3.1 + 1.8 + 1.8 + + + \ No newline at end of file diff --git a/core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streamcollectors/StreamGroupingByCollectorUnitTest.java b/core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streamcollectors/StreamGroupingByCollectorUnitTest.java new file mode 100644 index 0000000000..c50d73a638 --- /dev/null +++ b/core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streamcollectors/StreamGroupingByCollectorUnitTest.java @@ -0,0 +1,84 @@ +package com.baeldung.streamcollectors; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import java.util.Map; +import java.util.function.Function; +import java.util.stream.Collectors; + +import org.junit.Assert; +import org.junit.Test; + +public class StreamGroupingByCollectorUnitTest { + @Test + public void givenListOfStrings_whenGroupingEqualStrings_thenUseCollectorsGroupingByToGroupEqualStringsAndCountOfOccurrences() { + + List list = new ArrayList<>(Arrays.asList("Foo", "Bar", "Bar", "Foo", "Bar")); + + Map result = list.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.counting())); + Assert.assertEquals(new Long(2), result.get("Foo")); + Assert.assertEquals(new Long(3), result.get("Bar")); + + } + + @Test + public void givenListOfStrings_whenGroupingEqualLengthStrings_thenUseCollectorsGroupingByConcurrentToGroupEqualLengthStringsAndCountOfOccurrences() { + + List list = new ArrayList<>(Arrays.asList("Adam", "Bill", "Jack", "Joe", "Ian")); + + Map result = list.stream().collect(Collectors.groupingByConcurrent(String::length, Collectors.counting())); + Assert.assertEquals(new Long(2), result.get(3)); + Assert.assertEquals(new Long(3), result.get(4)); + + } + + @Test + public void givenListOfEmployees_whenGroupingDepartmentId_thenUseCollectorsGroupingByDepartmentIdAndCountNumberOfEmployeesWithinEveryDepartment() { + + List list = new ArrayList<>(Arrays.asList(new Employee(1, "Joe", 1), new Employee(2, "Josh", 1), new Employee(3, "Jamie", 2), new Employee(4, "Jim", 2), new Employee(5, "Jack", 2))); + + Map result = list.stream().collect(Collectors.groupingBy(Employee::getDepartmentId, Collectors.counting())); + Assert.assertEquals(new Long(2), result.get(1)); + Assert.assertEquals(new Long(3), result.get(2)); + + } + + static class Employee { + + Integer employeeId; + String employeeName; + Integer departmentId; + + Employee(Integer employeeId, String employeeName, Integer departmentId) { + this.employeeId = employeeId; + this.employeeName = employeeName; + this.departmentId = departmentId; + } + + public Integer getEmployeeId() { + return employeeId; + } + + public void setEmployeeId(Integer employeeId) { + this.employeeId = employeeId; + } + + public String getEmployeeName() { + return employeeName; + } + + public void setEmployeeName(String employeeName) { + this.employeeName = employeeName; + } + + public Integer getDepartmentId() { + return departmentId; + } + + public void setDepartmentId(Integer departmentId) { + this.departmentId = departmentId; + } + } + +}