Bael 2053 (#5331)

* String performance class

* String intern performance

* String performance replace

* String performance concat

* String performance split

* String performance convert

* String performance comparison

* String performance ==

* String performance check length

* String performance

* String performance matches

* String performance hints

* String performance %d

* fixing benchmark tests

* String performance final

* method naming convention fix

* renaming class name

* remove loops

* String performance review checked

* remove methods

* remove unnecessary class after the merge

* Delete pom.xml

java-strings/src/main/java/com/baeldung/string/StringPerformance.java

@@ -1,23 +1,43 @@
 package com.baeldung.string;
 
+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 = 10000, iterations = 10)
+@Measurement(batchSize = 100000, iterations = 10)
-@Warmup(batchSize = 10000, iterations = 10)
+@Warmup(batchSize = 100000, iterations = 10)
-public class StringPerformance extends StringPerformanceHints {
+@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<String> stringSplit = new ArrayList<>();
+    protected List<String> stringTokenizer = new ArrayList<>();
 
     @Benchmark
     public String benchmarkStringDynamicConcat() {
-        return dynamicConcat();
+        result += baeldung;
+        return result;
     }
 
     @Benchmark
@@ -36,27 +56,30 @@ public class StringPerformance extends StringPerformanceHints {
 
     @Benchmark
     public String benchmarkStringConstructor() {
-        return stringConstructor();
+        String result = new String("baeldung");
+        return result;
     }
 
     @Benchmark
     public String benchmarkStringLiteral() {
-        return stringLiteral();
+        String result = "baeldung";
+        return result;
     }
 
     @Benchmark
     public String benchmarkStringFormat_s() {
-        return stringFormat_s();
+        return String.format(formatString, baeldung);
     }
 
     @Benchmark
     public String benchmarkStringConcat() {
-        return stringConcat();
+        result = result.concat(baeldung);
+        return result;
     }
 
     @Benchmark
     public String benchmarkStringIntern() {
-        return stringIntern();
+        return baeldung.intern();
     }
 
     @Benchmark
@@ -71,85 +94,95 @@ public class StringPerformance extends StringPerformanceHints {
 
     @Benchmark
     public List<String> benchmarkGuavaSplitter() {
-        return guavaSplitter();
+        return Splitter.on(" ").trimResults()
+                .omitEmptyStrings()
+                .splitToList(longString);
     }
 
     @Benchmark
     public String [] benchmarkStringSplit() {
-        return stringSplit();
+        return longString.split(emptyString);
     }
 
     @Benchmark
     public String [] benchmarkStringSplitPattern() {
-        return stringSplitPattern();
+        return spacePattern.split(longString, 0);
     }
 
     @Benchmark
     public List benchmarkStringTokenizer() {
-        return stringTokenizer();
+        StringTokenizer st = new StringTokenizer(longString);
+        while (st.hasMoreTokens()) {
+            stringTokenizer.add(st.nextToken());
+        }
+        return stringTokenizer;
     }
 
     @Benchmark
     public List benchmarkStringIndexOf() {
-        return stringIndexOf();
+        int pos = 0, end;
+        while ((end = longString.indexOf(' ', pos)) >= 0) {
+            stringSplit.add(longString.substring(pos, end));
+            pos = end + 1;
+        }
+        return stringSplit;
     }
 
-
     @Benchmark
     public String benchmarkIntegerToString() {
-        return stringIntegerToString();
+        return Integer.toString(sampleNumber);
     }
 
     @Benchmark
     public String benchmarkStringValueOf() {
-        return stringValueOf();
+        return String.valueOf(sampleNumber);
     }
 
 
     @Benchmark
     public String benchmarkStringConvertPlus() {
-        return stringConvertPlus();
+        return sampleNumber + "";
     }
 
         @Benchmark
     public String benchmarkStringFormat_d() {
-        return stringFormat_d();
+        return String.format(formatDigit, sampleNumber);
     }
 
     @Benchmark
     public boolean benchmarkStringEquals() {
-        return stringEquals();
+        return longString.equals(baeldung);
     }
 
 
     @Benchmark
     public boolean benchmarkStringEqualsIgnoreCase() {
-        return stringEqualsIgnoreCase();
+        return longString.equalsIgnoreCase(baeldung);
     }
 
     @Benchmark
     public boolean benchmarkStringMatches() {
-        return stringIsMatch();
+        return longString.matches(baeldung);
     }
 
     @Benchmark
     public boolean benchmarkPrecompiledMatches() {
-        return precompiledMatches();
+        return longPattern.matcher(baeldung).matches();
     }
 
     @Benchmark
     public int benchmarkStringCompareTo() {
-        return stringCompareTo();
+        return longString.compareTo(baeldung);
     }
 
     @Benchmark
     public boolean benchmarkStringIsEmpty() {
-        return stringIsEmpty();
+        return longString.isEmpty();
     }
 
     @Benchmark
     public boolean benchmarkStringLengthZero() {
-        return stringLengthZero();
+        return longString.length() == 0;
     }
 
     public static void main(String[] args) throws Exception {

java-strings/src/main/java/com/baeldung/string/StringPerformanceHints.java

@@ -1,133 +0,0 @@
-package com.baeldung.string;
-
-import com.google.common.base.Splitter;
-import org.openjdk.jmh.annotations.Scope;
-import org.openjdk.jmh.annotations.State;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.StringTokenizer;
-import java.util.regex.Pattern;
-
-@State(Scope.Thread)
-public class StringPerformanceHints {
-
-    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<String> stringSplit = new ArrayList<>();
-    protected List<String> stringTokenizer = new ArrayList<>();
-
-    protected String dynamicConcat() {
-        result += baeldung;
-        return result;
-    }
-
-    protected String stringConstructor() {
-        return new String(baeldung);
-    }
-
-    protected String stringLiteral() {
-        result = baeldung;
-        return result;
-    }
-
-    protected String stringFormat_s() {
-        return String.format(formatString, baeldung);
-    }
-
-    protected String stringFormat_d() {
-        return String.format(formatDigit, sampleNumber);
-    }
-
-    protected String stringConcat() {
-        result = result.concat(baeldung);
-        return result;
-    }
-
-    protected List stringTokenizer() {
-        StringTokenizer st = new StringTokenizer(longString);
-        while (st.hasMoreTokens()) {
-            stringTokenizer.add(st.nextToken());
-        }
-        return stringTokenizer;
-    }
-
-    protected List stringIndexOf() {
-        int pos = 0, end;
-        while ((end = longString.indexOf(' ', pos)) >= 0) {
-            stringSplit.add(longString.substring(pos, end));
-            pos = end + 1;
-        }
-        return stringSplit;
-    }
-
-    protected String stringIntegerToString() {
-        return Integer.toString(sampleNumber);
-    }
-
-    protected String stringValueOf() {
-        return String.valueOf(sampleNumber);
-    }
-
-
-    protected String stringConvertPlus() {
-        return sampleNumber + "";
-    }
-
-
-    protected boolean stringEquals() {
-        return longString.equals(baeldung);
-    }
-
-
-    protected boolean stringEqualsIgnoreCase() {
-        return longString.equalsIgnoreCase(baeldung);
-    }
-
-    protected boolean stringIsMatch() {
-        return longString.matches(baeldung);
-    }
-
-    protected boolean precompiledMatches() {
-        return longPattern.matcher(baeldung).matches();
-    }
-
-    protected int stringCompareTo() {
-        return longString.compareTo(baeldung);
-    }
-
-    protected boolean stringIsEmpty() {
-        return longString.isEmpty();
-    }
-
-    protected boolean stringLengthZero() {
-        return longString.length() == 0;
-    }
-
-    protected String [] stringSplitPattern() {
-        return spacePattern.split(longString, 0);
-    }
-
-    protected String [] stringSplit() {
-        return longString.split(emptyString);
-    }
-
-    protected List<String> guavaSplitter() {
-        return Splitter.on(" ").trimResults()
-                .omitEmptyStrings()
-                .splitToList(longString);
-    }
-
-    protected String stringIntern() {
-        return baeldung.intern();
-    }
-}