Merge branch 'master' of https://github.com/eugenp/tutorials into task/BAEL-9467

This commit is contained in:
Dhawal Kapil 2018-10-16 23:23:36 +05:30
commit 510fe26236
190 changed files with 4516 additions and 423 deletions

2
.gitignore vendored
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@ -62,3 +62,5 @@ jmeter/src/main/resources/*-JMeter.csv
**/dist
**/tmp
**/out-tsc
**/nbproject/
**/nb-configuration.xml

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@ -21,3 +21,8 @@ In additional to Spring, the following technologies are in focus: `core Java`, `
Building the project
====================
To do the full build, do: `mvn install -Pdefault -Dgib.enabled=false`
Building a single module
====================
To build a specific module run the command: `mvn clean install -Dgib.enabled=false` in the module directory

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@ -28,3 +28,6 @@
- [Calculate the Distance Between Two Points in Java](https://www.baeldung.com/java-distance-between-two-points)
- [Find the Intersection of Two Lines in Java](https://www.baeldung.com/java-intersection-of-two-lines)
- [Check If a String Contains All The Letters of The Alphabet](https://www.baeldung.com/java-string-contains-all-letters)
- [Round Up to the Nearest Hundred](https://www.baeldung.com/java-round-up-nearest-hundred)
- [Merge Sort in Java](https://www.baeldung.com/java-merge-sort)
- [Calculate Percentage in Java](https://www.baeldung.com/java-calculate-percentage)

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@ -17,6 +17,11 @@
<artifactId>commons-math3</artifactId>
<version>${commons-math3.version}</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>${commons-codec.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
@ -85,6 +90,7 @@
<io.jenetics.version>3.7.0</io.jenetics.version>
<org.jgrapht.core.version>1.0.1</org.jgrapht.core.version>
<org.assertj.core.version>3.9.0</org.assertj.core.version>
<commons-codec.version>1.11</commons-codec.version>
</properties>
</project>

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@ -0,0 +1,110 @@
package com.baeldung.algorithms.conversion;
import java.math.BigInteger;
import javax.xml.bind.DatatypeConverter;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;
import com.google.common.io.BaseEncoding;
public class HexStringConverter {
/**
* Create a byte Array from String of hexadecimal digits using Character conversion
* @param hexString - Hexadecimal digits as String
* @return Desired byte Array
*/
public byte[] decodeHexString(String hexString) {
if (hexString.length() % 2 == 1) {
throw new IllegalArgumentException("Invalid hexadecimal String supplied.");
}
byte[] bytes = new byte[hexString.length() / 2];
for (int i = 0; i < hexString.length(); i += 2) {
bytes[i / 2] = hexToByte(hexString.substring(i, i + 2));
}
return bytes;
}
/**
* Create a String of hexadecimal digits from a byte Array using Character conversion
* @param byteArray - The byte Array
* @return Desired String of hexadecimal digits in lower case
*/
public String encodeHexString(byte[] byteArray) {
StringBuffer hexStringBuffer = new StringBuffer();
for (int i = 0; i < byteArray.length; i++) {
hexStringBuffer.append(byteToHex(byteArray[i]));
}
return hexStringBuffer.toString();
}
public String byteToHex(byte num) {
char[] hexDigits = new char[2];
hexDigits[0] = Character.forDigit((num >> 4) & 0xF, 16);
hexDigits[1] = Character.forDigit((num & 0xF), 16);
return new String(hexDigits);
}
public byte hexToByte(String hexString) {
int firstDigit = toDigit(hexString.charAt(0));
int secondDigit = toDigit(hexString.charAt(1));
return (byte) ((firstDigit << 4) + secondDigit);
}
private int toDigit(char hexChar) {
int digit = Character.digit(hexChar, 16);
if(digit == -1) {
throw new IllegalArgumentException("Invalid Hexadecimal Character: "+ hexChar);
}
return digit;
}
public String encodeUsingBigIntegerToString(byte[] bytes) {
BigInteger bigInteger = new BigInteger(1, bytes);
return bigInteger.toString(16);
}
public String encodeUsingBigIntegerStringFormat(byte[] bytes) {
BigInteger bigInteger = new BigInteger(1, bytes);
return String.format("%0" + (bytes.length << 1) + "x", bigInteger);
}
public byte[] decodeUsingBigInteger(String hexString) {
byte[] byteArray = new BigInteger(hexString, 16).toByteArray();
if (byteArray[0] == 0) {
byte[] output = new byte[byteArray.length - 1];
System.arraycopy(byteArray, 1, output, 0, output.length);
return output;
}
return byteArray;
}
public String encodeUsingDataTypeConverter(byte[] bytes) {
return DatatypeConverter.printHexBinary(bytes);
}
public byte[] decodeUsingDataTypeConverter(String hexString) {
return DatatypeConverter.parseHexBinary(hexString);
}
public String encodeUsingApacheCommons(byte[] bytes) throws DecoderException {
return Hex.encodeHexString(bytes);
}
public byte[] decodeUsingApacheCommons(String hexString) throws DecoderException {
return Hex.decodeHex(hexString);
}
public String encodeUsingGuava(byte[] bytes) {
return BaseEncoding.base16()
.encode(bytes);
}
public byte[] decodeUsingGuava(String hexString) {
return BaseEncoding.base16()
.decode(hexString.toUpperCase());
}
}

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@ -0,0 +1,127 @@
package com.baeldung.algorithms.conversion;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import org.apache.commons.codec.DecoderException;
import org.hamcrest.text.IsEqualIgnoringCase;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.algorithms.conversion.HexStringConverter;
public class ByteArrayConverterUnitTest {
private HexStringConverter hexStringConverter;
@Before
public void setup() {
hexStringConverter = new HexStringConverter();
}
@Test
public void shouldEncodeByteArrayToHexStringUsingBigIntegerToString() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
if(hexString.charAt(0) == '0') {
hexString = hexString.substring(1);
}
String output = hexStringConverter.encodeUsingBigIntegerToString(bytes);
assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
}
@Test
public void shouldEncodeByteArrayToHexStringUsingBigIntegerStringFormat() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
String output = hexStringConverter.encodeUsingBigIntegerStringFormat(bytes);
assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
}
@Test
public void shouldDecodeHexStringToByteArrayUsingBigInteger() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
byte[] output = hexStringConverter.decodeUsingBigInteger(hexString);
assertArrayEquals(bytes, output);
}
@Test
public void shouldEncodeByteArrayToHexStringUsingCharacterConversion() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
String output = hexStringConverter.encodeHexString(bytes);
assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
}
@Test
public void shouldDecodeHexStringToByteArrayUsingCharacterConversion() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
byte[] output = hexStringConverter.decodeHexString(hexString);
assertArrayEquals(bytes, output);
}
@Test(expected=IllegalArgumentException.class)
public void shouldDecodeHexToByteWithInvalidHexCharacter() {
hexStringConverter.hexToByte("fg");
}
@Test
public void shouldEncodeByteArrayToHexStringDataTypeConverter() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
String output = hexStringConverter.encodeUsingDataTypeConverter(bytes);
assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
}
@Test
public void shouldDecodeHexStringToByteArrayUsingDataTypeConverter() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
byte[] output = hexStringConverter.decodeUsingDataTypeConverter(hexString);
assertArrayEquals(bytes, output);
}
@Test
public void shouldEncodeByteArrayToHexStringUsingGuava() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
String output = hexStringConverter.encodeUsingGuava(bytes);
assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
}
@Test
public void shouldDecodeHexStringToByteArrayUsingGuava() {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
byte[] output = hexStringConverter.decodeUsingGuava(hexString);
assertArrayEquals(bytes, output);
}
@Test
public void shouldEncodeByteArrayToHexStringUsingApacheCommons() throws DecoderException {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
String output = hexStringConverter.encodeUsingApacheCommons(bytes);
assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
}
@Test
public void shouldDecodeHexStringToByteArrayUsingApacheCommons() throws DecoderException {
byte[] bytes = getSampleBytes();
String hexString = getSampleHexString();
byte[] output = hexStringConverter.decodeUsingApacheCommons(hexString);
assertArrayEquals(bytes, output);
}
private String getSampleHexString() {
return "0af50c0e2d10";
}
private byte[] getSampleBytes() {
return new byte[] { 10, -11, 12, 14, 45, 16 };
}
}

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@ -9,4 +9,4 @@
- [Integration Testing with a Local DynamoDB Instance](http://www.baeldung.com/dynamodb-local-integration-tests)
- [Using the JetS3t Java Client With Amazon S3](http://www.baeldung.com/jets3t-amazon-s3)
- [Managing Amazon SQS Queues in Java](http://www.baeldung.com/aws-queues-java)
- [Guide to AWS Aurora RDS with Java](https://www.baeldung.com/aws-aurora-rds-java)

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@ -1,46 +0,0 @@
package com.baeldung.internationalization;
import org.junit.Assert;
import org.junit.Test;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Locale;
import java.util.TimeZone;
public class DateTimeFormatterUnitTest {
@Test
public void givenDefaultUsLocaleAndDateTimeAndPattern_whenFormatWithDifferentLocales_thenGettingLocalizedDateTimes() {
Locale.setDefault(Locale.US);
LocalDateTime localDateTime = LocalDateTime.of(2018, 1, 1, 10, 15, 50, 500);
String pattern = "dd-MMMM-yyyy HH:mm:ss.SSS";
DateTimeFormatter defaultTimeFormatter = DateTimeFormatter.ofPattern(pattern);
DateTimeFormatter plTimeFormatter = DateTimeFormatter.ofPattern(pattern, new Locale("pl", "PL"));
DateTimeFormatter deTimeFormatter = DateTimeFormatter.ofPattern(pattern).withLocale(Locale.GERMANY);
Assert.assertEquals("01-January-2018 10:15:50.000", defaultTimeFormatter.format(localDateTime));
Assert.assertEquals("01-stycznia-2018 10:15:50.000", plTimeFormatter.format(localDateTime));
Assert.assertEquals("01-Januar-2018 10:15:50.000", deTimeFormatter.format(localDateTime));
}
@Test
public void givenDateTimeAndTimeZone_whenFormatWithDifferentLocales_thenGettingLocalizedZonedDateTimes() {
Locale.setDefault(Locale.US);
LocalDateTime localDateTime = LocalDateTime.of(2018, 1, 1, 10, 15, 50, 500);
ZoneId losAngelesTimeZone = TimeZone.getTimeZone("America/Los_Angeles").toZoneId();
DateTimeFormatter localizedFormatter = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.FULL);
DateTimeFormatter frLocalizedFormatter =
DateTimeFormatter.ofLocalizedDateTime(FormatStyle.FULL).withLocale(Locale.FRANCE);
String formattedDateTime = localizedFormatter.format(ZonedDateTime.of(localDateTime, losAngelesTimeZone));
String frFormattedDateTime = frLocalizedFormatter.format(ZonedDateTime.of(localDateTime, losAngelesTimeZone));
Assert.assertEquals("Monday, January 1, 2018 10:15:50 AM PST", formattedDateTime);
Assert.assertEquals("lundi 1 janvier 2018 10 h 15 PST", frFormattedDateTime);
}
}

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@ -26,3 +26,4 @@
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)

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@ -52,3 +52,6 @@
- [Performance of contains() in a HashSet vs ArrayList](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
- [Get the Key for a Value from a Java Map](https://www.baeldung.com/java-map-key-from-value)
- [Time Complexity of Java Collections](https://www.baeldung.com/java-collections-complexity)
- [Sort a HashMap in Java](https://www.baeldung.com/java-hashmap-sort)
- [Finding the Highest Value in a Java Map](https://www.baeldung.com/java-find-map-max)
- [Operating on and Removing an Item from Stream](https://www.baeldung.com/java-use-remove-item-stream)

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@ -1,7 +1,6 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-collections</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
@ -68,15 +67,14 @@
<artifactId>commons-exec</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>one.util</groupId>
<artifactId>streamex</artifactId>
<version>0.6.5</version>
</dependency>
</dependencies>
<properties>
<openjdk.jmh.version>1.19</openjdk.jmh.version>
<junit.platform.version>1.2.0</junit.platform.version>

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@ -0,0 +1,52 @@
package com.baeldung.convertcollectiontoarraylist;
/**
* This POJO is the element type of our collection. It has a deepCopy() method.
*
* @author chris
*/
public class Foo {
private int id;
private String name;
private Foo parent;
public Foo() {
}
public Foo(int id, String name, Foo parent) {
this.id = id;
this.name = name;
this.parent = parent;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Foo getParent() {
return parent;
}
public void setParent(Foo parent) {
this.parent = parent;
}
public Foo deepCopy() {
return new Foo(
this.id, this.name, this.parent != null ? this.parent.deepCopy() : null);
}
}

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@ -0,0 +1,45 @@
package com.baeldung.enumset;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
public class EnumSets {
public enum Color {
RED, YELLOW, GREEN, BLUE, BLACK, WHITE
}
public static void main(String[] args) {
EnumSet<Color> allColors = EnumSet.allOf(Color.class);
System.out.println(allColors);
EnumSet<Color> noColors = EnumSet.noneOf(Color.class);
System.out.println(noColors);
EnumSet<Color> blackAndWhite = EnumSet.of(Color.BLACK, Color.WHITE);
System.out.println(blackAndWhite);
EnumSet<Color> noBlackOrWhite = EnumSet.complementOf(blackAndWhite);
System.out.println(noBlackOrWhite);
EnumSet<Color> range = EnumSet.range(Color.YELLOW, Color.BLUE);
System.out.println(range);
EnumSet<Color> blackAndWhiteCopy = EnumSet.copyOf(EnumSet.of(Color.BLACK, Color.WHITE));
System.out.println(blackAndWhiteCopy);
List<Color> colorsList = new ArrayList<>();
colorsList.add(Color.RED);
EnumSet<Color> listCopy = EnumSet.copyOf(colorsList);
System.out.println(listCopy);
EnumSet<Color> set = EnumSet.noneOf(Color.class);
set.add(Color.RED);
set.add(Color.YELLOW);
set.contains(Color.RED);
set.forEach(System.out::println);
set.remove(Color.RED);
}
}

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@ -0,0 +1,18 @@
package com.baeldung.synchronizedcollections.application;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.logging.Logger;
public class Application {
private static final Logger LOGGER = Logger.getLogger(Application.class.getName());
public static void main(String[] args) throws InterruptedException {
List<Integer> syncCollection = Collections.synchronizedList(Arrays.asList(1, 2, 3, 4, 5, 6));
synchronized (syncCollection) {
syncCollection.forEach((e) -> {LOGGER.info(e.toString());});
}
}
}

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@ -0,0 +1,148 @@
package com.baeldung.convertcollectiontoarraylist;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import static java.util.stream.Collectors.toCollection;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.junit.Assert.*;
/**
*
* @author chris
*/
public class FooUnitTest {
private static Collection<Foo> srcCollection = new HashSet<>();
public FooUnitTest() {
}
@BeforeClass
public static void setUpClass() {
int i = 0;
Foo john = new Foo(i++, "John", null);
Foo mary = new Foo(i++, "Mary", null);
Foo sam = new Foo(i++, "Sam", john);
Foo alice = new Foo(i++, "Alice", john);
Foo buffy = new Foo(i++, "Buffy", sam);
srcCollection.add(john);
srcCollection.add(mary);
srcCollection.add(sam);
srcCollection.add(alice);
srcCollection.add(buffy);
// make sure the collection isn't sorted accidentally
assertFalse("Oops: source collection is already sorted!", isSorted(srcCollection));
}
/**
* Section 3. Using the ArrayList Constructor
*/
@Test
public void whenUsingConstructor_thenVerifyShallowCopy() {
ArrayList<Foo> newList = new ArrayList<>(srcCollection);
verifyShallowCopy(srcCollection, newList);
}
/**
* Section 4. Using the Streams API
*/
@Test
public void whenUsingStream_thenVerifyShallowCopy() {
ArrayList<Foo> newList = srcCollection.stream().collect(toCollection(ArrayList::new));
verifyShallowCopy(srcCollection, newList);
}
/**
* Section 5. Deep Copy
*/
@Test
public void whenUsingDeepCopy_thenVerifyDeepCopy() {
ArrayList<Foo> newList = srcCollection.stream()
.map(foo -> foo.deepCopy())
.collect(toCollection(ArrayList::new));
verifyDeepCopy(srcCollection, newList);
}
/**
* Section 6. Controlling the List Order
*/
@Test
public void whenUsingSortedStream_thenVerifySortOrder() {
ArrayList<Foo> newList = srcCollection.stream()
.sorted(Comparator.comparing(Foo::getName))
.collect(toCollection(ArrayList::new));
assertTrue("ArrayList is not sorted by name", isSorted(newList));
}
/**
* Verify that the contents of the two collections are the same
* @param a
* @param b
*/
private void verifyShallowCopy(Collection a, Collection b) {
assertEquals("Collections have different lengths", a.size(), b.size());
Iterator<Foo> iterA = a.iterator();
Iterator<Foo> iterB = b.iterator();
while (iterA.hasNext()) {
// use '==' to test instance identity
assertTrue("Foo instances differ!", iterA.next() == iterB.next());
}
}
/**
* Verify that the contents of the two collections are the same
* @param a
* @param b
*/
private void verifyDeepCopy(Collection a, Collection b) {
assertEquals("Collections have different lengths", a.size(), b.size());
Iterator<Foo> iterA = a.iterator();
Iterator<Foo> iterB = b.iterator();
while (iterA.hasNext()) {
Foo nextA = iterA.next();
Foo nextB = iterB.next();
// should not be same instance
assertFalse("Foo instances are the same!", nextA == nextB);
// but should have same content
assertFalse("Foo instances have different content!", fooDiff(nextA, nextB));
}
}
/**
* Return true if the contents of a and b differ. Test parent recursively
* @param a
* @param b
* @return False if the two items are the same
*/
private boolean fooDiff(Foo a, Foo b) {
if (a != null && b != null) {
return a.getId() != b.getId()
|| !a.getName().equals(b.getName())
|| fooDiff(a.getParent(), b.getParent());
}
return !(a == null && b == null);
}
/**
* @param c collection of Foo
* @return true if the collection is sorted by name
*/
private static boolean isSorted(Collection<Foo> c) {
String prevName = null;
for (Foo foo : c) {
if (prevName == null || foo.getName().compareTo(prevName) > 0) {
prevName = foo.getName();
} else {
return false;
}
}
return true;
}
}

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@ -0,0 +1,89 @@
package com.baeldung.findItems;
import static org.junit.Assert.assertEquals;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import org.junit.Test;
public class FindItemsBasedOnOtherStreamUnitTest {
private List<Employee> employeeList = new ArrayList<Employee>();
private List<Department> departmentList = new ArrayList<Department>();
@Test
public void givenDepartmentList_thenEmployeeListIsFilteredCorrectly() {
Integer expectedId = 1002;
populate(employeeList, departmentList);
List<Employee> filteredList = employeeList.stream()
.filter(empl -> departmentList.stream()
.anyMatch(dept -> dept.getDepartment()
.equals("sales") && empl.getEmployeeId()
.equals(dept.getEmployeeId())))
.collect(Collectors.toList());
assertEquals(expectedId, filteredList.get(0)
.getEmployeeId());
}
private void populate(List<Employee> EmplList, List<Department> deptList) {
Employee employee1 = new Employee(1001, "empl1");
Employee employee2 = new Employee(1002, "empl2");
Employee employee3 = new Employee(1003, "empl3");
Collections.addAll(EmplList, employee1, employee2, employee3);
Department department1 = new Department(1002, "sales");
Department department2 = new Department(1003, "marketing");
Department department3 = new Department(1004, "sales");
Collections.addAll(deptList, department1, department2, department3);
}
}
class Employee {
private Integer employeeId;
private String employeeName;
Employee(Integer employeeId, String employeeName) {
super();
this.employeeId = employeeId;
this.employeeName = employeeName;
}
Integer getEmployeeId() {
return employeeId;
}
public String getEmployeeName() {
return employeeName;
}
}
class Department {
private Integer employeeId;
private String department;
Department(Integer employeeId, String department) {
super();
this.employeeId = employeeId;
this.department = department;
}
Integer getEmployeeId() {
return employeeId;
}
String getDepartment() {
return department;
}
}

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@ -1,44 +0,0 @@
package com.baeldung.java.map;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.collections4.MultiMap;
import org.apache.commons.collections4.MultiMapUtils;
import org.apache.commons.collections4.MultiValuedMap;
import org.apache.commons.collections4.map.MultiValueMap;
import org.apache.commons.collections4.multimap.ArrayListValuedHashMap;
import org.apache.commons.collections4.multimap.HashSetValuedHashMap;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.TreeMultimap;
public class KeyCheckTest {
@Test
public void whenKeyIsPresent_thenContainsKeyReturnsTrue() {
Map<String, String> map = Collections.singletonMap("key", "value");
assertTrue(map.containsKey("key"));
assertFalse(map.containsKey("missing"));
}
@Test
public void whenKeyHasNullValue_thenGetStillWorks() {
Map<String, String> map = Collections.singletonMap("nothing", null);
assertTrue(map.containsKey("nothing"));
assertNull(map.get("nothing"));
}
}

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@ -0,0 +1,29 @@
package com.baeldung.java.map;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.util.Collections;
import java.util.Map;
import org.junit.Test;
public class KeyCheckUnitTest {
@Test
public void whenKeyIsPresent_thenContainsKeyReturnsTrue() {
Map<String, String> map = Collections.singletonMap("key", "value");
assertTrue(map.containsKey("key"));
assertFalse(map.containsKey("missing"));
}
@Test
public void whenKeyHasNullValue_thenGetStillWorks() {
Map<String, String> map = Collections.singletonMap("nothing", null);
assertTrue(map.containsKey("nothing"));
assertNull(map.get("nothing"));
}
}

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@ -0,0 +1,28 @@
package com.baeldung.synchronizedcollections.test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class SynchronizedCollectionUnitTest {
@Test
public void givenSynchronizedCollection_whenTwoThreadsAddElements_thenCorrectCollectionSize() throws InterruptedException {
Collection<Integer> syncCollection = Collections.synchronizedCollection(new ArrayList<>());
Runnable listOperations = () -> {
syncCollection.addAll(Arrays.asList(1, 2, 3, 4, 5, 6));
};
Thread thread1 = new Thread(listOperations);
Thread thread2 = new Thread(listOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(syncCollection.size()).isEqualTo(12);
}
}

View File

@ -0,0 +1,51 @@
package com.baeldung.synchronizedcollections.test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class SynchronizedListUnitTest {
@Test
public void givenSynchronizedList_whenTwoThreadsAddElements_thenCorrectListSize() throws InterruptedException {
List<Integer> syncList = Collections.synchronizedList(new ArrayList<>());
Runnable listOperations = () -> {
syncList.addAll(Arrays.asList(1, 2, 3, 4, 5, 6));
};
Thread thread1 = new Thread(listOperations);
Thread thread2 = new Thread(listOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(syncList.size()).isEqualTo(12);
}
@Test
public void givenStringList_whenTwoThreadsIterateOnSynchronizedList_thenCorrectResult() throws InterruptedException {
List<String> syncCollection = Collections.synchronizedList(Arrays.asList("a", "b", "c"));
List<String> uppercasedCollection = new ArrayList<>();
Runnable listOperations = () -> {
synchronized (syncCollection) {
syncCollection.forEach((e) -> {
uppercasedCollection.add(e.toUpperCase());
});
}
};
Thread thread1 = new Thread(listOperations);
Thread thread2 = new Thread(listOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(uppercasedCollection.get(0)).isEqualTo("A");
}
}

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@ -0,0 +1,30 @@
package com.baeldung.synchronizedcollections.test;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class SynchronizedMapUnitTest {
@Test
public void givenSynchronizedMap_whenTwoThreadsAddElements_thenCorrectMapSize() throws InterruptedException {
Map<Integer, String> syncMap = Collections.synchronizedMap(new HashMap<>());
Runnable mapOperations = () -> {
syncMap.put(1, "one");
syncMap.put(2, "two");
syncMap.put(3, "three");
};
Thread thread1 = new Thread(mapOperations);
Thread thread2 = new Thread(mapOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(syncMap.size()).isEqualTo(3);
}
}

View File

@ -0,0 +1,26 @@
package com.baeldung.synchronizedcollections.test;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class SynchronizedSetUnitTest {
@Test
public void givenSynchronizedSet_whenTwoThreadsAddElements_thenCorrectSetSize() throws InterruptedException {
Set<Integer> syncSet = Collections.synchronizedSet(new HashSet<>());
Runnable setOperations = () -> {syncSet.addAll(Arrays.asList(1, 2, 3, 4, 5, 6));};
Thread thread1 = new Thread(setOperations);
Thread thread2 = new Thread(setOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(syncSet.size()).isEqualTo(6);
}
}

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@ -0,0 +1,29 @@
package com.baeldung.synchronizedcollections.test;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class SynchronizedSortedMapUnitTest {
@Test
public void givenSynchronizedSorteMap_whenTwoThreadsAddElements_thenCorrectSortedMapSize() throws InterruptedException {
Map<Integer, String> syncSortedMap = Collections.synchronizedSortedMap(new TreeMap<>());
Runnable sortedMapOperations = () -> {
syncSortedMap.put(1, "One");
syncSortedMap.put(2, "Two");
syncSortedMap.put(3, "Three");
};
Thread thread1 = new Thread(sortedMapOperations);
Thread thread2 = new Thread(sortedMapOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(syncSortedMap.size()).isEqualTo(3);
}
}

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@ -0,0 +1,28 @@
package com.baeldung.synchronizedcollections.test;
import java.util.Arrays;
import java.util.Collections;
import java.util.SortedSet;
import java.util.TreeSet;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class SynchronizedSortedSetUnitTest {
@Test
public void givenSynchronizedSortedSet_whenTwoThreadsAddElements_thenCorrectSortedSetSize() throws InterruptedException {
SortedSet<Integer> syncSortedSet = Collections.synchronizedSortedSet(new TreeSet<>());
Runnable sortedSetOperations = () -> {syncSortedSet.addAll(Arrays.asList(1, 2, 3, 4, 5, 6));};
sortedSetOperations.run();
sortedSetOperations.run();
Thread thread1 = new Thread(sortedSetOperations);
Thread thread2 = new Thread(sortedSetOperations);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
assertThat(syncSortedSet.size()).isEqualTo(6);
}
}

View File

@ -29,3 +29,4 @@
- [A Custom Spring SecurityConfigurer](http://www.baeldung.com/spring-security-custom-configurer)
- [Life Cycle of a Thread in Java](http://www.baeldung.com/java-thread-lifecycle)
- [Runnable vs. Callable in Java](http://www.baeldung.com/java-runnable-callable)
- [Brief Introduction to Java Thread.yield()](https://www.baeldung.com/java-thread-yield)

View File

@ -185,4 +185,24 @@ public class CompletableFutureLongRunningUnitTest {
assertEquals("Hello World", future.get());
}
@Test
public void whenPassingTransformation_thenFunctionExecutionWithThenApply() throws InterruptedException, ExecutionException {
CompletableFuture<Integer> finalResult = compute().thenApply(s -> s + 1);
assertTrue(finalResult.get() == 11);
}
@Test
public void whenPassingPreviousStage_thenFunctionExecutionWithThenCompose() throws InterruptedException, ExecutionException {
CompletableFuture<Integer> finalResult = compute().thenCompose(this::computeAnother);
assertTrue(finalResult.get() == 20);
}
public CompletableFuture<Integer> compute(){
return CompletableFuture.supplyAsync(() -> 10);
}
public CompletableFuture<Integer> computeAnother(Integer i){
return CompletableFuture.supplyAsync(() -> 10 + i);
}
}

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@ -0,0 +1 @@
Test1

View File

@ -0,0 +1 @@
Test2

View File

@ -8,7 +8,7 @@ import java.io.IOException;
import org.junit.Before;
import org.junit.Test;
public class OutputStreamExamplesTest {
public class OutputStreamExamplesUnitTest {
StringBuilder filePath = new StringBuilder();

View File

@ -150,3 +150,9 @@
- [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
- [Add a Character to a String at a Given Position](https://www.baeldung.com/java-add-character-to-string)
- [Synthetic Constructs in Java](https://www.baeldung.com/java-synthetic)
- [Convert Double to String, Removing Decimal Places](https://www.baeldung.com/java-double-to-string)
- [Different Ways to Capture Java Heap Dumps](https://www.baeldung.com/java-heap-dump-capture)
- [How to Separate Double into Integer and Decimal Parts](https://www.baeldung.com/java-separate-double-into-integer-decimal-parts)
- [ZoneOffset in Java](https://www.baeldung.com/java-zone-offset)
- [Hashing a Password in Java](https://www.baeldung.com/java-password-hashing)
- [Java Switch Statement](https://www.baeldung.com/java-switch)

View File

@ -0,0 +1,159 @@
package com.baeldung.array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class ArrayReferenceGuide {
public static void main(String[] args) {
declaration();
initialization();
access();
iterating();
varargs();
transformIntoList();
transformIntoStream();
sort();
search();
merge();
}
private static void declaration() {
int[] anArray;
int anotherArray[];
}
private static void initialization() {
int[] anArray = new int[10];
anArray[0] = 10;
anArray[5] = 4;
int[] anotherArray = new int[] {1, 2, 3, 4, 5};
}
private static void access() {
int[] anArray = new int[10];
anArray[0] = 10;
anArray[5] = 4;
System.out.println(anArray[0]);
}
private static void iterating() {
int[] anArray = new int[] {1, 2, 3, 4, 5};
for (int i = 0; i < anArray.length; i++) {
System.out.println(anArray[i]);
}
for (int element : anArray) {
System.out.println(element);
}
}
private static void varargs() {
String[] groceries = new String[] {"Milk", "Tomato", "Chips"};
varargMethod(groceries);
varargMethod("Milk", "Tomato", "Chips");
}
private static void varargMethod(String... varargs) {
for (String element : varargs) {
System.out.println(element);
}
}
private static void transformIntoList() {
Integer[] anArray = new Integer[] {1, 2, 3, 4, 5};
// Naïve implementation
List<Integer> aList = new ArrayList<>(); // We create an empty list
for (int element : anArray) {
// We iterate over array's elements and add them to the list
aList.add(element);
}
// Pretty implementation
aList = Arrays.asList(anArray);
// Drawbacks
try {
aList.remove(0);
} catch (UnsupportedOperationException e) {
System.out.println(e.getMessage());
}
try {
aList.add(6);
} catch (UnsupportedOperationException e) {
System.out.println(e.getMessage());
}
int[] anotherArray = new int[] {1, 2, 3, 4, 5};
// List<Integer> anotherList = Arrays.asList(anotherArray);
}
private static void transformIntoStream() {
int[] anArray = new int[] {1, 2, 3, 4, 5};
IntStream aStream = Arrays.stream(anArray);
Integer[] anotherArray = new Integer[] {1, 2, 3, 4, 5};
Stream<Integer> anotherStream = Arrays.stream(anotherArray, 2, 4);
}
private static void sort() {
int[] anArray = new int[] {5, 2, 1, 4, 8};
Arrays.sort(anArray); // anArray is now {1, 2, 4, 5, 8}
Integer[] anotherArray = new Integer[] {5, 2, 1, 4, 8};
Arrays.sort(anotherArray); // anArray is now {1, 2, 4, 5, 8}
String[] yetAnotherArray = new String[] {"A", "E", "Z", "B", "C"};
Arrays.sort(yetAnotherArray, 1, 3, Comparator.comparing(String::toString).reversed()); // yetAnotherArray is now {"A", "Z", "E", "B", "C"}
}
private static void search() {
int[] anArray = new int[] {5, 2, 1, 4, 8};
for (int i = 0; i < anArray.length; i++) {
if (anArray[i] == 4) {
System.out.println("Found at index " + i);
break;
}
}
Arrays.sort(anArray);
int index = Arrays.binarySearch(anArray, 4);
System.out.println("Found at index " + index);
}
private static void merge() {
int[] anArray = new int[] {5, 2, 1, 4, 8};
int[] anotherArray = new int[] {10, 4, 9, 11, 2};
int[] resultArray = new int[anArray.length + anotherArray.length];
for (int i = 0; i < resultArray.length; i++) {
resultArray[i] = (i < anArray.length ? anArray[i] : anotherArray[i - anArray.length]);
}
for (int element : resultArray) {
System.out.println(element);
}
Arrays.setAll(resultArray, i -> (i < anArray.length ? anArray[i] : anotherArray[i - anArray.length]));
for (int element : resultArray) {
System.out.println(element);
}
}
}

View File

@ -1,11 +1,14 @@
package com.baeldung.classloader;
import java.io.*;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
public class CustomClassLoader extends ClassLoader {
public Class getClass(String name) throws ClassNotFoundException {
@Override
public Class findClass(String name) throws ClassNotFoundException {
byte[] b = loadClassFromFile(name);
return defineClass(name, b, 0, b.length);
}

View File

@ -0,0 +1,136 @@
package com.baeldung.heapsort;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Heap<E extends Comparable<E>> {
private List<E> elements = new ArrayList<>();
public static <E extends Comparable<E>> List<E> sort(Iterable<E> elements) {
Heap<E> heap = of(elements);
List<E> result = new ArrayList<>();
while (!heap.isEmpty()) {
result.add(heap.pop());
}
return result;
}
public static <E extends Comparable<E>> Heap<E> of(E... elements) {
return of(Arrays.asList(elements));
}
public static <E extends Comparable<E>> Heap<E> of(Iterable<E> elements) {
Heap<E> result = new Heap<>();
for (E element : elements) {
result.add(element);
}
return result;
}
public void add(E e) {
elements.add(e);
int elementIndex = elements.size() - 1;
while (!isRoot(elementIndex) && !isCorrectChild(elementIndex)) {
int parentIndex = parentIndex(elementIndex);
swap(elementIndex, parentIndex);
elementIndex = parentIndex;
}
}
public E pop() {
if (isEmpty()) {
throw new IllegalStateException("You cannot pop from an empty heap");
}
E result = elementAt(0);
int lasElementIndex = elements.size() - 1;
swap(0, lasElementIndex);
elements.remove(lasElementIndex);
int elementIndex = 0;
while (!isLeaf(elementIndex) && !isCorrectParent(elementIndex)) {
int smallerChildIndex = smallerChildIndex(elementIndex);
swap(elementIndex, smallerChildIndex);
elementIndex = smallerChildIndex;
}
return result;
}
public boolean isEmpty() {
return elements.isEmpty();
}
private boolean isRoot(int index) {
return index == 0;
}
private int smallerChildIndex(int index) {
int leftChildIndex = leftChildIndex(index);
int rightChildIndex = rightChildIndex(index);
if (!isValidIndex(rightChildIndex)) {
return leftChildIndex;
}
if (elementAt(leftChildIndex).compareTo(elementAt(rightChildIndex)) < 0) {
return leftChildIndex;
}
return rightChildIndex;
}
private boolean isLeaf(int index) {
return !isValidIndex(leftChildIndex(index));
}
private boolean isCorrectParent(int index) {
return isCorrect(index, leftChildIndex(index)) && isCorrect(index, rightChildIndex(index));
}
private boolean isCorrectChild(int index) {
return isCorrect(parentIndex(index), index);
}
private boolean isCorrect(int parentIndex, int childIndex) {
if (!isValidIndex(parentIndex) || !isValidIndex(childIndex)) {
return true;
}
return elementAt(parentIndex).compareTo(elementAt(childIndex)) < 0;
}
private boolean isValidIndex(int index) {
return index < elements.size();
}
private void swap(int index1, int index2) {
E element1 = elementAt(index1);
E element2 = elementAt(index2);
elements.set(index1, element2);
elements.set(index2, element1);
}
private E elementAt(int index) {
return elements.get(index);
}
private int parentIndex(int index) {
return (index - 1) / 2;
}
private int leftChildIndex(int index) {
return 2 * index + 1;
}
private int rightChildIndex(int index) {
return 2 * index + 2;
}
}

View File

@ -11,7 +11,7 @@ public class CustomClassLoaderUnitTest {
public void customLoader() throws ClassNotFoundException, IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException {
CustomClassLoader customClassLoader = new CustomClassLoader();
Class<?> c = customClassLoader.getClass(PrintClassLoader.class.getName());
Class<?> c = customClassLoader.findClass(PrintClassLoader.class.getName());
Object ob = c.newInstance();

View File

@ -0,0 +1,36 @@
package com.baeldung.heapsort;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.Arrays;
import java.util.List;
import org.junit.Test;
public class HeapUnitTest {
@Test
public void givenNotEmptyHeap_whenPopCalled_thenItShouldReturnSmallestElement() {
// given
Heap<Integer> heap = Heap.of(3, 5, 1, 4, 2);
// when
int head = heap.pop();
// then
assertThat(head).isEqualTo(1);
}
@Test
public void givenNotEmptyIterable_whenSortCalled_thenItShouldReturnElementsInSortedList() {
// given
List<Integer> elements = Arrays.asList(3, 5, 1, 4, 2);
// when
List<Integer> sortedElements = Heap.sort(elements);
// then
assertThat(sortedElements).isEqualTo(Arrays.asList(1, 2, 3, 4, 5));
}
}

View File

@ -0,0 +1,54 @@
package com.baeldung.modulo;
import org.junit.Test;
import static org.assertj.core.api.Java6Assertions.*;
public class ModuloUnitTest {
@Test
public void whenIntegerDivision_thenLosesRemainder(){
assertThat(11 / 4).isEqualTo(2);
}
@Test
public void whenDoubleDivision_thenKeepsRemainder(){
assertThat(11 / 4.0).isEqualTo(2.75);
}
@Test
public void whenModulo_thenReturnsRemainder(){
assertThat(11 % 4).isEqualTo(3);
}
@Test(expected = ArithmeticException.class)
public void whenDivisionByZero_thenArithmeticException(){
double result = 1 / 0;
}
@Test(expected = ArithmeticException.class)
public void whenModuloByZero_thenArithmeticException(){
double result = 1 % 0;
}
@Test
public void whenDivisorIsOddAndModulusIs2_thenResultIs1(){
assertThat(3 % 2).isEqualTo(1);
}
@Test
public void whenDivisorIsEvenAndModulusIs2_thenResultIs0(){
assertThat(4 % 2).isEqualTo(0);
}
@Test
public void whenItemsIsAddedToCircularQueue_thenNoArrayIndexOutOfBounds(){
int QUEUE_CAPACITY= 10;
int[] circularQueue = new int[QUEUE_CAPACITY];
int itemsInserted = 0;
for (int value = 0; value < 1000; value++) {
int writeIndex = ++itemsInserted % QUEUE_CAPACITY;
circularQueue[writeIndex] = value;
}
}
}

View File

@ -1,11 +1,11 @@
package com.baeldung.nth.root.calculator;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.runners.MockitoJUnitRunner;
import static org.junit.Assert.assertEquals;
import org.mockito.junit.MockitoJUnitRunner;
@RunWith(MockitoJUnitRunner.class)
public class NthRootCalculatorUnitTest {

View File

@ -37,3 +37,5 @@
- [Kotlin with Ktor](https://www.baeldung.com/kotlin-ktor)
- [Fuel HTTP Library with Kotlin](https://www.baeldung.com/kotlin-fuel)
- [Introduction to Kovenant Library for Kotlin](https://www.baeldung.com/kotlin-kovenant)
- [Converting Kotlin Data Class from JSON using GSON](https://www.baeldung.com/kotlin-json-convert-data-class)
- [Concatenate Strings in Kotlin](https://www.baeldung.com/kotlin-concatenate-strings)

View File

@ -0,0 +1,19 @@
package com.baeldung.datastructures
/**
* Example of how to use the {@link Node} class.
*
*/
fun main(args: Array<String>) {
val tree = Node(4)
val keys = arrayOf(8, 15, 21, 3, 7, 2, 5, 10, 2, 3, 4, 6, 11)
for (key in keys) {
tree.insert(key)
}
val node = tree.find(4)!!
println("Node with value ${node.key} [left = ${node.left?.key}, right = ${node.right?.key}]")
println("Delete node with key = 3")
node.delete(3)
print("Tree content after the node elimination: ")
println(tree.visit().joinToString { it.toString() })
}

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@ -0,0 +1,167 @@
package com.baeldung.datastructures
/**
* An ADT for a binary search tree.
* Note that this data type is neither immutable nor thread safe.
*/
class Node(
var key: Int,
var left: Node? = null,
var right: Node? = null) {
/**
* Return a node with given value. If no such node exists, return null.
* @param value
*/
fun find(value: Int): Node? = when {
this.key > value -> left?.find(value)
this.key < value -> right?.find(value)
else -> this
}
/**
* Insert a given value into the tree.
* After insertion, the tree should contain a node with the given value.
* If the tree already contains the given value, nothing is performed.
* @param value
*/
fun insert(value: Int) {
if (value > this.key) {
if (this.right == null) {
this.right = Node(value)
} else {
this.right?.insert(value)
}
} else if (value < this.key) {
if (this.left == null) {
this.left = Node(value)
} else {
this.left?.insert(value)
}
}
}
/**
* Delete the value from the given tree. If the tree does not contain the value, the tree remains unchanged.
* @param value
*/
fun delete(value: Int) {
when {
value > key -> scan(value, this.right, this)
value < key -> scan(value, this.left, this)
else -> removeNode(this, null)
}
}
/**
* Scan the tree in the search of the given value.
* @param value
* @param node sub-tree that potentially might contain the sought value
* @param parent node's parent
*/
private fun scan(value: Int, node: Node?, parent: Node?) {
if (node == null) {
System.out.println("value " + value
+ " seems not present in the tree.")
return
}
when {
value > node.key -> scan(value, node.right, node)
value < node.key -> scan(value, node.left, node)
value == node.key -> removeNode(node, parent)
}
}
/**
* Remove the node.
*
* Removal process depends on how many children the node has.
*
* @param node node that is to be removed
* @param parent parent of the node to be removed
*/
private fun removeNode(node: Node, parent: Node?) {
node.left?.let { leftChild ->
run {
node.right?.let {
removeTwoChildNode(node)
} ?: removeSingleChildNode(node, leftChild)
}
} ?: run {
node.right?.let { rightChild -> removeSingleChildNode(node, rightChild) } ?: removeNoChildNode(node, parent)
}
}
/**
* Remove the node without children.
* @param node
* @param parent
*/
private fun removeNoChildNode(node: Node, parent: Node?) {
parent?.let { p ->
if (node == p.left) {
p.left = null
} else if (node == p.right) {
p.right = null
}
} ?: throw IllegalStateException(
"Can not remove the root node without child nodes")
}
/**
* Remove a node that has two children.
*
* The process of elimination is to find the biggest key in the left sub-tree and replace the key of the
* node that is to be deleted with that key.
*/
private fun removeTwoChildNode(node: Node) {
val leftChild = node.left!!
leftChild.right?.let {
val maxParent = findParentOfMaxChild(leftChild)
maxParent.right?.let {
node.key = it.key
maxParent.right = null
} ?: throw IllegalStateException("Node with max child must have the right child!")
} ?: run {
node.key = leftChild.key
node.left = leftChild.left
}
}
/**
* Return a node whose right child contains the biggest value in the given sub-tree.
* Assume that the node n has a non-null right child.
*
* @param n
*/
private fun findParentOfMaxChild(n: Node): Node {
return n.right?.let { r -> r.right?.let { findParentOfMaxChild(r) } ?: n }
?: throw IllegalArgumentException("Right child must be non-null")
}
/**
* Remove a parent that has only one child.
* Removal is effectively is just coping the data from the child parent to the parent parent.
* @param parent Node to be deleted. Assume that it has just one child
* @param child Assume it is a child of the parent
*/
private fun removeSingleChildNode(parent: Node, child: Node) {
parent.key = child.key
parent.left = child.left
parent.right = child.right
}
fun visit(): Array<Int> {
val a = left?.visit() ?: emptyArray()
val b = right?.visit() ?: emptyArray()
return a + arrayOf(key) + b
}
}

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@ -0,0 +1,23 @@
package com.baeldung.interfaces
interface BaseInterface {
fun someMethod(): String
}
interface FirstChildInterface : BaseInterface {
override fun someMethod(): String {
return("Hello, from someMethod in FirstChildInterface")
}
}
interface SecondChildInterface : BaseInterface {
override fun someMethod(): String {
return("Hello, from someMethod in SecondChildInterface")
}
}
class ChildClass : FirstChildInterface, SecondChildInterface {
override fun someMethod(): String {
return super<SecondChildInterface>.someMethod()
}
}

View File

@ -0,0 +1,13 @@
package com.baeldung.interfaces
interface MyInterface {
fun someMethod(): String
}
class MyClass() : MyInterface {
override fun someMethod(): String {
return("Hello, World!")
}
}
class MyDerivedClass(myInterface: MyInterface) : MyInterface by myInterface

View File

@ -0,0 +1,29 @@
package com.baeldung.interfaces
interface FirstInterface {
fun someMethod(): String
fun anotherMethod(): String {
return("Hello, from anotherMethod in FirstInterface")
}
}
interface SecondInterface {
fun someMethod(): String {
return("Hello, from someMethod in SecondInterface")
}
fun anotherMethod(): String {
return("Hello, from anotherMethod in SecondInterface")
}
}
class SomeClass: FirstInterface, SecondInterface {
override fun someMethod(): String {
return("Hello, from someMethod in SomeClass")
}
override fun anotherMethod(): String {
return("Hello, from anotherMethod in SomeClass")
}
}

View File

@ -0,0 +1,24 @@
package com.baeldung.interfaces
interface SimpleInterface {
val firstProp: String
val secondProp: String
get() = "Second Property"
fun firstMethod(): String
fun secondMethod(): String {
println("Hello, from: " + secondProp)
return ""
}
}
class SimpleClass: SimpleInterface {
override val firstProp: String = "First Property"
override val secondProp: String
get() = "Second Property, Overridden!"
override fun firstMethod(): String {
return("Hello, from: " + firstProp)
}
override fun secondMethod(): String {
return("Hello, from: " + secondProp + firstProp)
}
}

View File

@ -0,0 +1,319 @@
package com.baeldung.datastructures
import org.junit.After
import org.junit.Assert.*
import org.junit.Before
import org.junit.Test
class NodeTest {
@Before
fun setUp() {
}
@After
fun tearDown() {
}
/**
* Test suit for finding the node by value
* Partition the tests as follows:
* 1. tree depth: 0, 1, > 1
* 2. pivot depth location: not present, 0, 1, 2, > 2
*/
/**
* Find the node by value
* 1. tree depth: 0
* 2. pivot depth location: not present
*/
@Test
fun givenDepthZero_whenPivotNotPresent_thenNull() {
val n = Node(1)
assertNull(n.find(2))
}
/**
* Find the node by value
* 1. tree depth: 0
* 2. pivot depth location: 0
*/
@Test
fun givenDepthZero_whenPivotDepthZero_thenReturnNodeItself() {
val n = Node(1)
assertEquals(n, n.find(1))
}
/**
* Find the node by value
* 1. tree depth: 1
* 2. pivot depth location: not present
*/
@Test
fun givenDepthOne_whenPivotNotPresent_thenNull() {
val n = Node(1, Node(0))
assertNull(n.find(2))
}
/**
* Find the node by value
* 1. tree depth: 1
* 2. pivot depth location: not present
*/
@Test
fun givenDepthOne_whenPivotAtDepthOne_thenSuccess() {
val n = Node(1, Node(0))
assertEquals(n.left, n.find(0)
)
}
@Test
fun givenDepthTwo_whenPivotAtDepth2_then_Success() {
val left = Node(1, Node(0), Node(2))
val right = Node(5, Node(4), Node(6))
val n = Node(3, left, right)
assertEquals(left.left, n.find(0))
}
/**
* Test suit for inserting a value
* Partition the test as follows:
* 1. tree depth: 0, 1, 2, > 2
* 2. depth to insert: 0, 1, > 1
* 3. is duplicate: no, yes
* 4. sub-tree: left, right
*/
/**
* Test for inserting a value
* 1. tree depth: 0
* 2. depth to insert: 1
* 3. is duplicate: no
* 4. sub-tree: right
*/
@Test
fun givenTreeDepthZero_whenInsertNoDuplicateToRight_thenAddNode() {
val n = Node(1)
n.insert(2)
assertEquals(1, n.key)
with(n.right!!) {
assertEquals(2, key)
assertNull(left)
assertNull(right)
}
assertNull(n.left)
}
/**
* Test for inserting a value
* 1. tree depth: 0
* 2. depth to insert: 1
* 3. is duplicate: no
* 4. sub-tree: right
*/
@Test
fun givenTreeDepthZero_whenInsertNoDuplicateToLeft_thenSuccess() {
val n = Node(1)
n.insert(0)
assertEquals(1, n.key)
with(n.left!!) {
assertEquals(0, key)
assertNull(left)
assertNull(right)
}
assertNull(n.right)
}
/**
* Test for inserting a value
* 1. tree depth: 0
* 2. depth to insert: 1
* 3. is duplicate: yes
*/
@Test
fun givenTreeDepthZero_whenInsertDuplicate_thenSuccess() {
val n = Node(1)
n.insert(1)
assertEquals(1, n.key)
assertNull(n.right)
assertNull(n.left)
}
/**
* Test suit for inserting a value
* Partition the test as follows:
* 1. tree depth: 0, 1, 2, > 2
* 2. depth to insert: 0, 1, > 1
* 3. is duplicate: no, yes
* 4. sub-tree: left, right
*/
/**
* Test for inserting a value
* 1. tree depth: 1
* 2. depth to insert: 1
* 3. is duplicate: no
* 4. sub-tree: right
*/
@Test
fun givenTreeDepthOne_whenInsertNoDuplicateToRight_thenSuccess() {
val n = Node(10, Node(3))
n.insert(15)
assertEquals(10, n.key)
with(n.right!!) {
assertEquals(15, key)
assertNull(left)
assertNull(right)
}
with(n.left!!) {
assertEquals(3, key)
assertNull(left)
assertNull(right)
}
}
/**
* Test for inserting a value
* 1. tree depth: 1
* 2. depth to insert: 1
* 3. is duplicate: no
* 4. sub-tree: left
*/
@Test
fun givenTreeDepthOne_whenInsertNoDuplicateToLeft_thenAddNode() {
val n = Node(10, null, Node(15))
n.insert(3)
assertEquals(10, n.key)
with(n.right!!) {
assertEquals(15, key)
assertNull(left)
assertNull(right)
}
with(n.left!!) {
assertEquals(3, key)
assertNull(left)
assertNull(right)
}
}
/**
* Test for inserting a value
* 1. tree depth: 1
* 2. depth to insert: 1
* 3. is duplicate: yes
*/
@Test
fun givenTreeDepthOne_whenInsertDuplicate_thenNoChange() {
val n = Node(10, null, Node(15))
n.insert(15)
assertEquals(10, n.key)
with(n.right!!) {
assertEquals(15, key)
assertNull(left)
assertNull(right)
}
assertNull(n.left)
}
/**
* Test suit for removal
* Partition the input as follows:
* 1. tree depth: 0, 1, 2, > 2
* 2. value to delete: absent, present
* 3. # child nodes: 0, 1, 2
*/
/**
* Test for removal value
* 1. tree depth: 0
* 2. value to delete: absent
*/
@Test
fun givenTreeDepthZero_whenValueAbsent_thenNoChange() {
val n = Node(1)
n.delete(0)
assertEquals(1, n.key)
assertNull(n.left)
assertNull(n.right)
}
/**
* Test for removal
* 1. tree depth: 1
* 2. value to delete: absent
*/
@Test
fun givenTreeDepthOne_whenValueAbsent_thenNoChange() {
val n = Node(1, Node(0), Node(2))
n.delete(3)
assertEquals(1, n.key)
assertEquals(2, n.right!!.key)
with(n.left!!) {
assertEquals(0, key)
assertNull(left)
assertNull(right)
}
with(n.right!!) {
assertNull(left)
assertNull(right)
}
}
/**
* Test suit for removal
* 1. tree depth: 1
* 2. value to delete: present
* 3. # child nodes: 0
*/
@Test
fun givenTreeDepthOne_whenNodeToDeleteHasNoChildren_thenChangeTree() {
val n = Node(1, Node(0))
n.delete(0)
assertEquals(1, n.key)
assertNull(n.left)
assertNull(n.right)
}
/**
* Test suit for removal
* 1. tree depth: 2
* 2. value to delete: present
* 3. # child nodes: 1
*/
@Test
fun givenTreeDepthTwo_whenNodeToDeleteHasOneChild_thenChangeTree() {
val n = Node(2, Node(0, null, Node(1)), Node(3))
n.delete(0)
assertEquals(2, n.key)
with(n.right!!) {
assertEquals(3, key)
assertNull(left)
assertNull(right)
}
with(n.left!!) {
assertEquals(1, key)
assertNull(left)
assertNull(right)
}
}
@Test
fun givenTreeDepthThree_whenNodeToDeleteHasTwoChildren_thenChangeTree() {
val l = Node(2, Node(1), Node(5, Node(4), Node(6)))
val r = Node(10, Node(9), Node(11))
val n = Node(8, l, r)
n.delete(8)
assertEquals(6, n.key)
with(n.left!!) {
assertEquals(2, key)
assertEquals(1, left!!.key)
assertEquals(5, right!!.key)
assertEquals(4, right!!.left!!.key)
}
with(n.right!!) {
assertEquals(10, key)
assertEquals(9, left!!.key)
assertEquals(11, right!!.key)
}
}
}

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@ -0,0 +1,32 @@
package com.baeldung.interfaces
import org.junit.Test
import kotlin.test.assertEquals
class InterfaceExamplesUnitTest {
@Test
fun givenAnInterface_whenImplemented_thenBehavesAsOverridden() {
val simpleClass = SimpleClass()
assertEquals("Hello, from: First Property", simpleClass.firstMethod())
assertEquals("Hello, from: Second Property, Overridden!First Property", simpleClass.secondMethod())
}
@Test
fun givenMultipleInterfaces_whenImplemented_thenBehavesAsOverridden() {
val someClass = SomeClass()
assertEquals("Hello, from someMethod in SomeClass", someClass.someMethod())
assertEquals("Hello, from anotherMethod in SomeClass", someClass.anotherMethod())
}
@Test
fun givenConflictingInterfaces_whenImplemented_thenBehavesAsOverridden() {
val childClass = ChildClass()
assertEquals("Hello, from someMethod in SecondChildInterface", childClass.someMethod())
}
@Test
fun givenAnInterface_whenImplemented_thenBehavesAsDelegated() {
val myClass = MyClass()
assertEquals("Hello, World!", MyDerivedClass(myClass).someMethod())
}
}

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@ -0,0 +1,25 @@
plugins {
// Apply the java-library plugin to add support for Java Library
id 'java-library'
}
dependencies {
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.1'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.1'
// Only necessary for JUnit 3 and 4 tests
testCompileOnly 'junit:junit:4.12'
testRuntimeOnly 'org.junit.vintage:junit-vintage-engine:5.3.1'
}
repositories {
jcenter()
}
test {
useJUnitPlatform {
includeTags 'fast'
excludeTags 'slow'
}
}

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@ -0,0 +1,12 @@
package com.example;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class CalculatorJUnit4Test {
@Test
public void testAdd() {
assertEquals(42, Integer.sum(19, 23));
}
}

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@ -0,0 +1,36 @@
package com.example;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;;
public class CalculatorJUnit5Test {
@Tag("fast")
@Test
public void testAdd() {
assertEquals(42, Integer.sum(19, 23));
}
@Tag("slow")
@Test
public void testAddMaxInteger() {
assertEquals(2147483646, Integer.sum(2147183646, 300000));
}
@Tag("fast")
@Test
public void testAddZero() {
assertEquals(21, Integer.sum(21, 0));
}
@Tag("fast")
@Test
public void testDivide() {
assertThrows(ArithmeticException.class, () -> {
Integer.divideUnsigned(42, 0);
});
}
}

View File

@ -5,6 +5,6 @@ include 'greeting-library'
include 'greeting-library-java'
include 'greeter'
include 'gradletaskdemo'
include 'junit5'
println 'This will be executed during the initialization phase.'

13
guava-collections/.gitignore vendored Normal file
View File

@ -0,0 +1,13 @@
*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear

View File

@ -0,0 +1,20 @@
=========
## Guava and Hamcrest Cookbooks and Examples
### Relevant Articles:
- [Guava Collections Cookbook](http://www.baeldung.com/guava-collections)
- [Guava Ordering Cookbook](http://www.baeldung.com/guava-order)
- [Hamcrest Collections Cookbook](http://www.baeldung.com/hamcrest-collections-arrays)
- [Partition a List in Java](http://www.baeldung.com/java-list-split)
- [Filtering and Transforming Collections in Guava](http://www.baeldung.com/guava-filter-and-transform-a-collection)
- [Guava Join and Split Collections](http://www.baeldung.com/guava-joiner-and-splitter-tutorial)
- [Guava Lists](http://www.baeldung.com/guava-lists)
- [Guava Sets](http://www.baeldung.com/guava-sets)
- [Guava Maps](http://www.baeldung.com/guava-maps)
- [Guide to Guava Multimap](http://www.baeldung.com/guava-multimap)
- [Guide to Guava RangeSet](http://www.baeldung.com/guava-rangeset)
- [Guide to Guava RangeMap](http://www.baeldung.com/guava-rangemap)
- [Guide to Guava MinMaxPriorityQueue and EvictingQueue](http://www.baeldung.com/guava-minmax-priority-queue-and-evicting-queue)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)

66
guava-collections/pom.xml Normal file
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@ -0,0 +1,66 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>guava-collections</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>guava-collections</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<dependencies>
<!-- utils -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hamcrest/java-hamcrest -->
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>java-hamcrest</artifactId>
<version>${java-hamcrest.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>guava</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<properties>
<!-- util -->
<guava.version>24.0-jre</guava.version>
<commons-lang3.version>3.5</commons-lang3.version>
<commons-collections4.version>4.1</commons-collections4.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<java-hamcrest.version>2.0.0.0</java-hamcrest.version>
</properties>
</project>

View File

@ -0,0 +1,19 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

View File

@ -0,0 +1,13 @@
*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear

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@ -0,0 +1 @@
John Jane Adam Tom

View File

@ -0,0 +1 @@
Hello world

View File

@ -0,0 +1 @@
Test

View File

@ -0,0 +1,4 @@
John
Jane
Adam
Tom

View File

@ -0,0 +1 @@
Hello world

Binary file not shown.

View File

@ -4,33 +4,19 @@
### Relevant Articles:
- [Guava Collections Cookbook](http://www.baeldung.com/guava-collections)
- [Guava Ordering Cookbook](http://www.baeldung.com/guava-order)
- [Guava Functional Cookbook](http://www.baeldung.com/guava-functions-predicates)
- [Hamcrest Collections Cookbook](http://www.baeldung.com/hamcrest-collections-arrays)
- [Partition a List in Java](http://www.baeldung.com/java-list-split)
- [Filtering and Transforming Collections in Guava](http://www.baeldung.com/guava-filter-and-transform-a-collection)
- [Guava Join and Split Collections](http://www.baeldung.com/guava-joiner-and-splitter-tutorial)
- [Guava Write to File, Read from File](http://www.baeldung.com/guava-write-to-file-read-from-file)
- [Guava Lists](http://www.baeldung.com/guava-lists)
- [Guava Sets](http://www.baeldung.com/guava-sets)
- [Guava Maps](http://www.baeldung.com/guava-maps)
- [Guava Set + Function = Map](http://www.baeldung.com/guava-set-function-map-tutorial)
- [Guide to Guavas Ordering](http://www.baeldung.com/guava-ordering)
- [Guide to Guavas PreConditions](http://www.baeldung.com/guava-preconditions)
- [Introduction to Guava CacheLoader](http://www.baeldung.com/guava-cacheloader)
- [Introduction to Guava Memoizer](http://www.baeldung.com/guava-memoizer)
- [Guide to Guavas EventBus](http://www.baeldung.com/guava-eventbus)
- [Guide to Guava Multimap](http://www.baeldung.com/guava-multimap)
- [Guide to Guava RangeSet](http://www.baeldung.com/guava-rangeset)
- [Guide to Guava RangeMap](http://www.baeldung.com/guava-rangemap)
- [Guide to Guava Table](http://www.baeldung.com/guava-table)
- [Guide to Guavas Reflection Utilities](http://www.baeldung.com/guava-reflection)
- [Guide to Guava ClassToInstanceMap](http://www.baeldung.com/guava-class-to-instance-map)
- [Guide to Guava MinMaxPriorityQueue and EvictingQueue](http://www.baeldung.com/guava-minmax-priority-queue-and-evicting-queue)
- [Guide to Mathematical Utilities in Guava](http://www.baeldung.com/guava-math)
- [Bloom Filter in Java using Guava](http://www.baeldung.com/guava-bloom-filter)
- [Using Guava CountingOutputStream](http://www.baeldung.com/guava-counting-outputstream)
- [Hamcrest Text Matchers](http://www.baeldung.com/hamcrest-text-matchers)
- [Quick Guide to the Guava RateLimiter](http://www.baeldung.com/guava-rate-limiter)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)

View File

@ -14,12 +14,6 @@
</parent>
<dependencies>
<!-- utils -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
@ -56,7 +50,6 @@
<!-- util -->
<guava.version>24.0-jre</guava.version>
<commons-lang3.version>3.5</commons-lang3.version>
<commons-collections4.version>4.1</commons-collections4.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>

View File

@ -16,3 +16,4 @@
- [Hibernate Entity Lifecycle](https://www.baeldung.com/hibernate-entity-lifecycle)
- [Mapping A Hibernate Query to a Custom Class](https://www.baeldung.com/hibernate-query-to-custom-class)
- [@JoinColumn Annotation Explained](https://www.baeldung.com/jpa-join-column)
- [Hibernate 5 Naming Strategy Configuration](https://www.baeldung.com/hibernate-naming-strategy)

View File

@ -4,13 +4,23 @@ import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.Parameter;
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequence-generator")
@SequenceGenerator(name = "sequence-generator", sequenceName = "user_sequence", initialValue = 4)
@GeneratedValue(generator = "sequence-generator")
@GenericGenerator(
name = "sequence-generator",
strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator",
parameters = {
@Parameter(name = "sequence_name", value = "user_sequence"),
@Parameter(name = "initial_value", value = "4"),
@Parameter(name = "increment_size", value = "1")
}
)
private long userId;
public long getUserId() {

View File

@ -80,7 +80,7 @@
<joda-time.version>2.10</joda-time.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<maven.compiler.source>9</maven.compiler.source>
<maven.compiler.target>9</maven.compiler.target>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
</properties>
</project>

View File

@ -51,6 +51,15 @@ public class DateDiffUnitTest {
assertEquals(diff, 6);
}
@Test
public void givenTwoZonedDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
LocalDateTime ldt = LocalDateTime.now();
ZonedDateTime now = ldt.atZone(ZoneId.of("America/Montreal"));
ZonedDateTime sixDaysBehind = now.withZoneSameInstant(ZoneId.of("Asia/Singapore")).minusDays(6);
long diff = ChronoUnit.DAYS.between(sixDaysBehind, now);
assertEquals(diff, 6);
}
@Test
public void givenTwoDatesInJodaTime_whenDifferentiating_thenWeGetSix() {
org.joda.time.LocalDate now = org.joda.time.LocalDate.now();

View File

@ -0,0 +1,158 @@
package com.baeldung.datetime;
import org.junit.Assert;
import org.junit.Test;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.format.FormatStyle;
import java.time.temporal.ChronoUnit;
import java.util.Locale;
import java.util.TimeZone;
public class DateTimeFormatterUnitTest {
@Test
public void givenDefaultUsLocaleAndDateTimeAndPattern_whenFormatWithDifferentLocales_thenGettingLocalizedDateTimes() {
Locale.setDefault(Locale.US);
LocalDateTime localDateTime = LocalDateTime.of(2018, 1, 1, 10, 15, 50, 500);
String pattern = "dd-MMMM-yyyy HH:mm:ss.SSS";
DateTimeFormatter defaultTimeFormatter = DateTimeFormatter.ofPattern(pattern);
DateTimeFormatter plTimeFormatter = DateTimeFormatter.ofPattern(pattern, new Locale("pl", "PL"));
DateTimeFormatter deTimeFormatter = DateTimeFormatter.ofPattern(pattern).withLocale(Locale.GERMANY);
Assert.assertEquals("01-January-2018 10:15:50.000", defaultTimeFormatter.format(localDateTime));
Assert.assertEquals("01-stycznia-2018 10:15:50.000", plTimeFormatter.format(localDateTime));
Assert.assertEquals("01-Januar-2018 10:15:50.000", deTimeFormatter.format(localDateTime));
}
@Test
public void givenDateTimeAndTimeZone_whenFormatWithDifferentLocales_thenGettingLocalizedZonedDateTimes() {
Locale.setDefault(Locale.US);
LocalDateTime localDateTime = LocalDateTime.of(2018, 1, 1, 10, 15, 50, 500);
ZoneId losAngelesTimeZone = TimeZone.getTimeZone("America/Los_Angeles").toZoneId();
DateTimeFormatter localizedFormatter = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.FULL);
DateTimeFormatter frLocalizedFormatter =
DateTimeFormatter.ofLocalizedDateTime(FormatStyle.FULL).withLocale(Locale.FRANCE);
String formattedDateTime = localizedFormatter.format(ZonedDateTime.of(localDateTime, losAngelesTimeZone));
String frFormattedDateTime = frLocalizedFormatter.format(ZonedDateTime.of(localDateTime, losAngelesTimeZone));
Assert.assertEquals("Monday, January 1, 2018 10:15:50 AM PST", formattedDateTime);
Assert.assertEquals("lundi 1 janvier 2018 10 h 15 PST", frFormattedDateTime);
}
@Test
public void shouldPrintFormattedDate() {
String europeanDatePattern = "dd.MM.yyyy";
DateTimeFormatter europeanDateFormatter = DateTimeFormatter.ofPattern(europeanDatePattern);
LocalDate summerDay = LocalDate.of(2016, 7, 31);
Assert.assertEquals("31.07.2016", europeanDateFormatter.format(summerDay));
}
@Test
public void shouldPrintFormattedTime24() {
String timeColonPattern = "HH:mm:ss";
DateTimeFormatter timeColonFormatter = DateTimeFormatter.ofPattern(timeColonPattern);
LocalTime colonTime = LocalTime.of(17, 35, 50);
Assert.assertEquals("17:35:50", timeColonFormatter.format(colonTime));
}
@Test
public void shouldPrintFormattedTimeWithMillis() {
String timeColonPattern = "HH:mm:ss SSS";
DateTimeFormatter timeColonFormatter = DateTimeFormatter.ofPattern(timeColonPattern);
LocalTime colonTime = LocalTime.of(17, 35, 50).plus(329, ChronoUnit.MILLIS);
Assert.assertEquals("17:35:50 329", timeColonFormatter.format(colonTime));
}
@Test
public void shouldPrintFormattedTimePM() {
String timeColonPattern = "hh:mm:ss a";
DateTimeFormatter timeColonFormatter = DateTimeFormatter.ofPattern(timeColonPattern);
LocalTime colonTime = LocalTime.of(17, 35, 50);
Assert.assertEquals("05:35:50 PM", timeColonFormatter.format(colonTime));
}
@Test
public void shouldPrintFormattedUTCRelatedZonedDateTime() {
String newYorkDateTimePattern = "dd.MM.yyyy HH:mm z";
DateTimeFormatter newYorkDateFormatter = DateTimeFormatter.ofPattern(newYorkDateTimePattern);
LocalDateTime summerDay = LocalDateTime.of(2016, 7, 31, 14, 15);
Assert.assertEquals("31.07.2016 14:15 UTC-04:00", newYorkDateFormatter.format(ZonedDateTime.of(summerDay, ZoneId.of("UTC-4"))));
}
@Test
public void shouldPrintFormattedNewYorkZonedDateTime() {
String newYorkDateTimePattern = "dd.MM.yyyy HH:mm z";
DateTimeFormatter newYorkDateFormatter = DateTimeFormatter.ofPattern(newYorkDateTimePattern);
LocalDateTime summerDay = LocalDateTime.of(2016, 7, 31, 14, 15);
Assert.assertEquals("31.07.2016 14:15 EDT", newYorkDateFormatter.format(ZonedDateTime.of(summerDay, ZoneId.of("America/New_York"))));
}
@Test
public void shouldPrintStyledDate() {
LocalDate anotherSummerDay = LocalDate.of(2016, 8, 23);
Assert.assertEquals("Tuesday, August 23, 2016", DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL).format(anotherSummerDay));
Assert.assertEquals("August 23, 2016", DateTimeFormatter.ofLocalizedDate(FormatStyle.LONG).format(anotherSummerDay));
Assert.assertEquals("Aug 23, 2016", DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).format(anotherSummerDay));
Assert.assertEquals("8/23/16", DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT).format(anotherSummerDay));
}
@Test
public void shouldPrintStyledDateTime() {
LocalDateTime anotherSummerDay = LocalDateTime.of(2016, 8, 23, 13, 12, 45);
Assert.assertEquals("Tuesday, August 23, 2016 1:12:45 PM EET", DateTimeFormatter.ofLocalizedDateTime(FormatStyle.FULL).withZone(ZoneId.of("Europe/Helsinki")).format(anotherSummerDay));
Assert.assertEquals("August 23, 2016 1:12:45 PM EET", DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG).withZone(ZoneId.of("Europe/Helsinki")).format(anotherSummerDay));
Assert.assertEquals("Aug 23, 2016 1:12:45 PM", DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM).withZone(ZoneId.of("Europe/Helsinki")).format(anotherSummerDay));
Assert.assertEquals("8/23/16 1:12 PM", DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT).withZone(ZoneId.of("Europe/Helsinki")).format(anotherSummerDay));
}
@Test
public void shouldPrintFormattedDateTimeWithPredefined() {
Assert.assertEquals("2018-03-09", DateTimeFormatter.ISO_LOCAL_DATE.format(LocalDate.of(2018, 3, 9)));
Assert.assertEquals("2018-03-09-03:00", DateTimeFormatter.ISO_OFFSET_DATE.format(LocalDate.of(2018, 3, 9).atStartOfDay(ZoneId.of("UTC-3"))));
Assert.assertEquals("Fri, 9 Mar 2018 00:00:00 -0300", DateTimeFormatter.RFC_1123_DATE_TIME.format(LocalDate.of(2018, 3, 9).atStartOfDay(ZoneId.of("UTC-3"))));
}
@Test
public void shouldParseDateTime() {
Assert.assertEquals(LocalDate.of(2018, 3, 12), LocalDate.from(DateTimeFormatter.ISO_LOCAL_DATE.parse("2018-03-09")).plusDays(3));
}
@Test
public void shouldParseFormatStyleFull() {
ZonedDateTime dateTime = ZonedDateTime.from(DateTimeFormatter.ofLocalizedDateTime(FormatStyle.FULL).parse("Tuesday, August 23, 2016 1:12:45 PM EET"));
Assert.assertEquals(ZonedDateTime.of(LocalDateTime.of(2016, 8, 23, 22, 12, 45), ZoneId.of("Europe/Bucharest")), dateTime.plusHours(9));
}
@Test
public void shouldParseDateWithCustomFormatter() {
DateTimeFormatter europeanDateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy");
Assert.assertFalse(LocalDate.from(europeanDateFormatter.parse("15.08.2014")).isLeapYear());
}
@Test
public void shouldParseTimeWithCustomFormatter() {
DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("hh:mm:ss a");
Assert.assertTrue(LocalTime.from(timeFormatter.parse("12:25:30 AM")).isBefore(LocalTime.NOON));
}
@Test
public void shouldParseZonedDateTimeWithCustomFormatter() {
DateTimeFormatter zonedFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm z");
Assert.assertEquals(7200, ZonedDateTime.from(zonedFormatter.parse("31.07.2016 14:15 GMT+02:00")).getOffset().getTotalSeconds());
}
@Test(expected = DateTimeParseException.class)
public void shouldExpectAnExceptionIfDateTimeStringNotMatchPattern() {
DateTimeFormatter zonedFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm z");
ZonedDateTime.from(zonedFormatter.parse("31.07.2016 14:15"));
}
}

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@ -0,0 +1,43 @@
package com.baeldung.zoneddatetime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.logging.Logger;
import org.junit.Test;
public class ZonedDateTimeUnitTest {
private static final Logger log = Logger.getLogger(ZonedDateTimeUnitTest.class.getName());
@Test
public void testZonedDateTimeToString() {
ZonedDateTime zonedDateTimeNow = ZonedDateTime.now(ZoneId.of("UTC"));
ZonedDateTime zonedDateTimeOf = ZonedDateTime.of(2018, 01, 01, 0, 0, 0, 0, ZoneId.of("UTC"));
LocalDateTime localDateTime = LocalDateTime.now();
ZonedDateTime zonedDateTime = ZonedDateTime.of(localDateTime, ZoneId.of("UTC"));
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy - hh:mm:ss Z");
String formattedString = zonedDateTime.format(formatter);
DateTimeFormatter formatter2 = DateTimeFormatter.ofPattern("MM/dd/yyyy - hh:mm:ss z");
String formattedString2 = zonedDateTime.format(formatter2);
log.info(formattedString);
log.info(formattedString2);
}
@Test
public void testZonedDateTimeFromString() {
ZonedDateTime zonedDateTime = ZonedDateTime.parse("2011-12-03T10:15:30+01:00", DateTimeFormatter.ISO_ZONED_DATE_TIME);
log.info(zonedDateTime.format(DateTimeFormatter.ISO_ZONED_DATE_TIME));
}
}

View File

@ -13,3 +13,4 @@
- [How to Iterate Over a Stream With Indices](http://www.baeldung.com/java-stream-indices)
- [Primitive Type Streams in Java 8](http://www.baeldung.com/java-8-primitive-streams)
- [Stream Ordering in Java](https://www.baeldung.com/java-stream-ordering)
- [Introduction to Protonpack](https://www.baeldung.com/java-protonpack)

View File

@ -31,3 +31,5 @@
- [Converting a Stack Trace to a String in Java](https://www.baeldung.com/java-stacktrace-to-string)
- [Sorting a String Alphabetically in Java](https://www.baeldung.com/java-sort-string-alphabetically)
- [Remove Emojis from a Java String](https://www.baeldung.com/java-string-remove-emojis)
- [String Not Empty Test Assertions in Java](https://www.baeldung.com/java-assert-string-not-empty)
- [String Performance Hints](https://www.baeldung.com/java-string-performance)

View File

@ -9,3 +9,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
- [Java Bean Validation Basics](http://www.baeldung.com/javax-validation)
- [Validating Container Elements with Bean Validation 2.0](http://www.baeldung.com/bean-validation-container-elements)
- [Method Constraints with Bean Validation 2.0](http://www.baeldung.com/javax-validation-method-constraints)
- [Difference Between @NotNull, @NotEmpty, and @NotBlank Constraints in Bean Validation](https://www.baeldung.com/java-bean-validation-not-null-empty-blank)

View File

@ -33,7 +33,7 @@
<version>${javax.el-api.version}</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<groupId>org.glassfish</groupId>
<artifactId>javax.el</artifactId>
<version>${javax.el.version}</version>
</dependency>

2
jee-7-security/README.md Normal file
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@ -0,0 +1,2 @@
### Relevant Articles:
- [Securing Java EE with Spring Security](http://www.baeldung.com/java-ee-spring-security)

102
jee-7-security/pom.xml Normal file
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@ -0,0 +1,102 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>jee-7-security</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>jee-7-security</name>
<description>JavaEE 7 Spring Security Application</description>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>${javaee_api.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>${com.sun.faces.jsf.version}</version>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>${com.sun.faces.jsf.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${javax.servlet-api.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>${jsp-api.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>${taglibs.standard.version}</version>
</dependency>
<dependency>
<groupId>javax.mvc</groupId>
<artifactId>javax.mvc-api</artifactId>
<version>1.0-pr</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>${org.springframework.security.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>${org.springframework.security.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
<version>${org.springframework.security.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>${maven-war-plugin.version}</version>
<configuration>
<warSourceDirectory>src/main/webapp</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<javaee_api.version>7.0</javaee_api.version>
<com.sun.faces.jsf.version>2.2.14</com.sun.faces.jsf.version>
<jsp-api.version>2.2</jsp-api.version>
<taglibs.standard.version>1.1.2</taglibs.standard.version>
<org.springframework.security.version>4.2.3.RELEASE</org.springframework.security.version>
</properties>
</project>

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@ -1,4 +1,4 @@
package com.baeldung.springSecurity;
package com.baeldung.springsecurity;
import org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;

View File

@ -1,4 +1,4 @@
package com.baeldung.springSecurity;
package com.baeldung.springsecurity;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;

View File

@ -1,4 +1,4 @@
package com.baeldung.springSecurity.controller;
package com.baeldung.springsecurity.controller;
import javax.mvc.annotation.Controller;
import javax.ws.rs.GET;

View File

@ -1,4 +1,4 @@
package com.baeldung.springSecurity.controller;
package com.baeldung.springsecurity.controller;
import javax.mvc.annotation.Controller;
import javax.ws.rs.GET;

View File

@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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@ -0,0 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<faces-config
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
</faces-config>

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