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Merge branch 'master' of https://github.com/Maiklins/tutorials into JAVA-7244-Review_log_statements_for_projects

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 Conflicts:
	algorithms-searching/src/test/java/com/baeldung/algorithms/quadtree/QuadTreeSearchUnitTest.java
This commit is contained in:
mikr
2021-10-31 20:54:51 +01:00
parent 72f31df764 789b7267be
commit e3aebd9c10
767 changed files with 29744 additions and 20414 deletions
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core-java-modules/core-java-11-2/README.md
+1
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@@ -8,3 +8,4 @@ This module contains articles about Java 11 core features
- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
- [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
- [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
- [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)
core-java-modules/core-java-11-2/pom.xml
+3 -4
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@@ -35,19 +35,19 @@
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.jupiter.version}</version>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-params</artifactId>
<version>${junit.jupiter.version}</version>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.jupiter.version}</version>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
@@ -106,7 +106,6 @@
<maven.compiler.source.version>11</maven.compiler.source.version>
<maven.compiler.target.version>11</maven.compiler.target.version>
<guava.version>29.0-jre</guava.version>
<junit.jupiter.version>5.7.0</junit.jupiter.version>
<assertj.version>3.17.2</assertj.version>
<mockserver.version>5.11.1</mockserver.version>
<commons-lang3.version>3.12.0</commons-lang3.version>
core-java-modules/core-java-12/pom.xml
+52 -52
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@@ -1,60 +1,60 @@
<?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>core-java-12</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-12</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
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>core-java-12</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-12</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>
</dependencies>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>12</maven.compiler.source.version>
<maven.compiler.target.version>12</maven.compiler.target.version>
<assertj.version>3.6.1</assertj.version>
</properties>
<properties>
<maven.compiler.source.version>12</maven.compiler.source.version>
<maven.compiler.target.version>12</maven.compiler.target.version>
<assertj.version>3.6.1</assertj.version>
</properties>
</project>
core-java-modules/core-java-14/pom.xml
+2 -2
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@@ -14,7 +14,7 @@
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
@@ -35,7 +35,7 @@
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
core-java-modules/core-java-16/README.md
+4
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@@ -1,3 +1,7 @@
### Relevant articles:
- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)
- [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
- [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
- [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
core-java-modules/core-java-16/pom.xml
+68 -35
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@@ -1,53 +1,86 @@
<?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>core-java-16</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-16</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
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>core-java-16</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-16</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencies>
<build>
<plugins>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<argLine>--enable-preview</argLine>
<forkCount>1</forkCount>
</configuration>
<dependencies>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-api</artifactId>
<version>${surefire.plugin.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</plugins>
</build>
<properties>
<maven.compiler.source.version>16</maven.compiler.source.version>
<maven.compiler.target.version>16</maven.compiler.target.version>
<assertj.version>3.6.1</assertj.version>
</properties>
<properties>
<maven.compiler.source.version>16</maven.compiler.source.version>
<maven.compiler.target.version>16</maven.compiler.target.version>
<maven.compiler.release>16</maven.compiler.release>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
<assertj.version>3.17.2</assertj.version>
</properties>
</project>
core-java-modules/core-java-16/src/main/java/com/baeldung/features/HelloWorld.java
+7
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@@ -0,0 +1,7 @@
package com.baeldung.features;
interface HelloWorld {
default String hello() {
return "world";
}
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/OuterClass.java
+9
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@@ -0,0 +1,9 @@
package com.baeldung.features;
import com.baeldung.features.record.Book;
public class OuterClass {
class InnerClass {
Book book = new Book("Title", "author", "isbn");
}
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/VectorExample.java
+23
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@@ -0,0 +1,23 @@
package com.baeldung.features;
import jdk.incubator.vector.IntVector;
public class VectorExample {
public int[] scalarComputation(int[] a, int[] b) {
var c = new int[a.length];
for (int i = 0; i < a.length; i++) {
c[i] = a[i] * b[i];
}
return c;
}
public int[] vectorComputation(int[] a, int[] b) {
var c = new int[a.length];
var vectorA = IntVector.fromArray(IntVector.SPECIES_128, a, 0);
var vectorB = IntVector.fromArray(IntVector.SPECIES_128, b, 0);
var vectorC = vectorA.mul(vectorB);
vectorC.intoArray(c, 0);
return c;
}
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/model/Book.java
+44
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@@ -0,0 +1,44 @@
package com.baeldung.features.model;
import java.util.Objects;
public final class Book {
private final String title;
private final String author;
private final String isbn;
public Book(String title, String author, String isbn) {
this.title = title;
this.author = author;
this.isbn = isbn;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
public String getIsbn() {
return isbn;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Book book = (Book) o;
return Objects.equals(title, book.title) && Objects.equals(author, book.author) && Objects.equals(isbn, book.isbn);
}
@Override
public int hashCode() {
return Objects.hash(title, author, isbn);
}
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/record/Book.java
+4
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@@ -0,0 +1,4 @@
package com.baeldung.features.record;
public record Book(String title, String author, String isbn) {
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/JungleAnimal.java
+4
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@@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public sealed interface JungleAnimal permits Monkey, Snake {
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Monkey.java
+4
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@@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public final class Monkey implements JungleAnimal {
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Sealed.java
+13
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@@ -0,0 +1,13 @@
package com.baeldung.features.sealed;
public class Sealed {
public static void main(String... args) {
JungleAnimal j = new Monkey();
if (j instanceof Monkey m) {
// do logic
} else if (j instanceof Snake s) {
// do logic
}
}
}
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Snake.java
+4
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@@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public non-sealed class Snake implements JungleAnimal {
}
core-java-modules/core-java-16/src/main/java/module-info.java
+4
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@@ -0,0 +1,4 @@
module core.java {
requires jdk.incubator.vector;
requires org.apache.commons.lang3;
}
core-java-modules/core-java-16/src/test/java/com/baeldung/features/DayPeriodSupportUnitTest.java
+24
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@@ -0,0 +1,24 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import static org.assertj.core.api.Assertions.assertThat;
public class DayPeriodSupportUnitTest {
@Test
public void givenASpecificTime_whenFormattingUsingTheBSymbol_thenExpectVerbosePeriodOfDay() {
LocalTime date = LocalTime.parse("15:25:08.690791");
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("h B");
assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
formatter = DateTimeFormatter.ofPattern("h BBBB");
assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
formatter = DateTimeFormatter.ofPattern("h BBBBB");
assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
}
}
core-java-modules/core-java-16/src/test/java/com/baeldung/features/HelloWorldUnitTest.java
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@@ -0,0 +1,28 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import static java.lang.ClassLoader.getSystemClassLoader;
import static org.assertj.core.api.Assertions.assertThat;
class HelloWorldUnitTest {
@Test
public void givenAnInterfaceWithDefaulMethod_whenCreatingProxyInstance_thenCanInvokeDefaultMethod() throws Exception {
Object proxy = Proxy.newProxyInstance(getSystemClassLoader(), new Class<?>[] { HelloWorld.class },
(prox, method, args) -> {
if (method.isDefault()) {
return InvocationHandler.invokeDefault(prox, method, args);
}
return method.invoke(prox, args);
}
);
Method method = proxy.getClass().getMethod("hello");
assertThat(method.invoke(proxy)).isEqualTo("world");
}
}
core-java-modules/core-java-16/src/test/java/com/baeldung/features/InstanceOfPatternMatchingUnitTest.java
+18
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@@ -0,0 +1,18 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class InstanceOfPatternMatchingUnitTest {
@Test
void givenTheNewPatternMatchingAbility_whenComparingAgainstTheTradiationalApproach_thenBothVariablesAreEqual() {
Object obj = "TEST";
if (obj instanceof String a) {
String b = (String) obj;
assertThat(a).isEqualTo(b);
}
}
}
core-java-modules/core-java-16/src/test/java/com/baeldung/features/StreamToListUnitTest.java
+20
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@@ -0,0 +1,20 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import static org.assertj.core.api.Assertions.assertThat;
public class StreamToListUnitTest {
@Test
void givenAStream_whenCreatingANewListFromStream_thenCollectorsOrInbuiltFunctionAreEquivalent() {
List<String> integersAsString = Arrays.asList("1", "2", "3");
List<Integer> ints = integersAsString.stream().map(Integer::parseInt).collect(Collectors.toList());
List<Integer> intsEquivalent = integersAsString.stream().map(Integer::parseInt).toList();
assertThat(ints).isEqualTo(intsEquivalent);
}
}
core-java-modules/core-java-16/src/test/java/com/baeldung/features/VectorExampleUnitTest.java
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@@ -0,0 +1,21 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
class VectorExampleUnitTest {
@Test
void givenAScalarComputation_whenCalculatingUsingVectorAPI_thenResultIsSameAsPreviousMethodOfComputation() {
VectorExample objectUnderTest = new VectorExample();
int[] a = {1, 2, 3, 4};
int[] b = {5, 6, 7, 8};
int[] result = objectUnderTest.scalarComputation(a, b);
int[] result2 = objectUnderTest.vectorComputation(a, b);
assertArrayEquals(result, result2);
}
}
core-java-modules/core-java-16/src/test/java/com/baeldung/streams/StreamToListComparisonWithCollectorsToListUnitTest.java
+128
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@@ -0,0 +1,128 @@
package com.baeldung.streams;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
public class StreamToListComparisonWithCollectorsToListUnitTest {
@Test
public void whenAddingtoCollectToList_thenSuccess() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
Assertions.assertDoesNotThrow(() -> {
result.add("test");
});
}
@Test
public void whenSortingtoCollectToList_thenSuccess() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
Assertions.assertDoesNotThrow(() -> {
result.sort(String::compareToIgnoreCase);
});
}
@Test
public void whenAddingCollectUnmodifiableToList_thenException() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toUnmodifiableList());
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.add("test");
});
}
@Test
public void whenSortingCollectUnmodifiableToList_thenSortException() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toUnmodifiableList());
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.sort(String::compareToIgnoreCase);
});
}
@Test
public void whenAddingStreamToList_thenException() {
List<String> result = Stream.of(Locale.getISOCountries())
.toList();
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.add("test");
});
}
@Test
public void whenSortingStreamToList_thenException() {
List<String> result = Stream.of(Locale.getISOCountries())
.toList();
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.sort(String::compareToIgnoreCase);
});
}
@Test
public void whenComparingStreamToList_withCollectToList_thenEqual() {
List<String> streamToList = Stream.of(Locale.getISOCountries())
.toList();
List<String> collectToList = Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
Assertions.assertEquals(streamToList, collectToList);
}
@Test
public void whenComparingStreamToList_withUnmodifiedCollectToList_thenEqual() {
List<String> streamToList = Stream.of(Locale.getISOCountries())
.toList();
List<String> collectToUnmodifiableList = Stream.of(Locale.getISOCountries())
.collect(Collectors.toUnmodifiableList());
Assertions.assertEquals(streamToList, collectToUnmodifiableList);
}
@Test
public void whenNullCollectorsToList_thenSuccess() {
Assertions.assertDoesNotThrow(() -> {
Stream.of(null, null)
.collect(Collectors.toList());
});
}
@Test
public void whenNullCollectorsUnmodifiableToList_thenException() {
Assertions.assertThrows(NullPointerException.class, () -> {
Stream.of(null, null)
.collect(Collectors.toUnmodifiableList());
});
}
@Test
public void whenNullStreamToList_thenSuccess() {
Assertions.assertDoesNotThrow(() -> {
Stream.of(null, null)
.toList();
});
}
}
core-java-modules/core-java-17/README.md
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@@ -0,0 +1,3 @@
### Relevant articles:
- [Pattern Matching for Switch](https://www.baeldung.com/java-switch-pattern-matching)
core-java-modules/core-java-17/pom.xml
+81
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@@ -0,0 +1,81 @@
<?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>core-java-17</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-17</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
<forkCount>1</forkCount>
</configuration>
<dependencies>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-api</artifactId>
<version>${surefire.plugin.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>17</maven.compiler.source.version>
<maven.compiler.target.version>17</maven.compiler.target.version>
<maven.compiler.release>17</maven.compiler.release>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
<assertj.version>3.17.2</assertj.version>
</properties>
</project>
core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/GuardedPatterns.java
+25
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@@ -0,0 +1,25 @@
package com.baeldung.switchpatterns;
public class GuardedPatterns {
static double getDoubleValueUsingIf(Object o) {
return switch (o) {
case String s -> {
if (s.length() > 0) {
yield Double.parseDouble(s);
} else {
yield 0d;
}
}
default -> 0d;
};
}
static double getDoubleValueUsingGuardedPatterns(Object o) {
return switch (o) {
case String s && s.length() > 0 -> Double.parseDouble(s);
default -> 0d;
};
}
}
core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/HandlingNullValues.java
+20
View File
@@ -0,0 +1,20 @@
package com.baeldung.switchpatterns;
public class HandlingNullValues {
static double getDoubleUsingSwitchNullCase(Object o) {
return switch (o) {
case String s -> Double.parseDouble(s);
case null -> 0d;
default -> 0d;
};
}
static double getDoubleUsingSwitchTotalType(Object o) {
return switch (o) {
case String s -> Double.parseDouble(s);
case Object ob -> 0d;
};
}
}
core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/ParenthesizedPatterns.java
+29
View File
@@ -0,0 +1,29 @@
package com.baeldung.switchpatterns;
public class ParenthesizedPatterns {
static double getDoubleValueUsingIf(Object o) {
return switch (o) {
case String s -> {
if (s.length() > 0) {
if (s.contains("#") || s.contains("@")) {
yield 0d;
} else {
yield Double.parseDouble(s);
}
} else {
yield 0d;
}
}
default -> 0d;
};
}
static double getDoubleValueUsingParenthesizedPatterns(Object o) {
return switch (o) {
case String s && s.length() > 0 && !(s.contains("#") || s.contains("@")) -> Double.parseDouble(s);
default -> 0d;
};
}
}
core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/PatternMatching.java
+14
View File
@@ -0,0 +1,14 @@
package com.baeldung.switchpatterns;
public class PatternMatching {
public static void main(String[] args) {
Object o = args[0];
if (o instanceof String s) {
System.out.printf("Object is a string %s", s);
} else if(o instanceof Number n) {
System.out.printf("Object is a number %n", n);
}
}
}
core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/SwitchStatement.java
+14
View File
@@ -0,0 +1,14 @@
package com.baeldung.switchpatterns;
public class SwitchStatement {
public static void main(String[] args) {
final String b = "B";
switch (args[0]) {
case "A" -> System.out.println("Parameter is A");
case b -> System.out.println("Parameter is b");
default -> System.out.println("Parameter is unknown");
};
}
}
core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/TypePatterns.java
+30
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@@ -0,0 +1,30 @@
package com.baeldung.switchpatterns;
public class TypePatterns {
static double getDoubleUsingIf(Object o) {
double result;
if (o instanceof Integer) {
result = ((Integer) o).doubleValue();
} else if (o instanceof Float) {
result = ((Float) o).doubleValue();
} else if (o instanceof String) {
result = Double.parseDouble(((String) o));
} else {
result = 0d;
}
return result;
}
static double getDoubleUsingSwitch(Object o) {
return switch (o) {
case Integer i -> i.doubleValue();
case Float f -> f.doubleValue();
case String s -> Double.parseDouble(s);
default -> 0d;
};
}
}

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