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BAEL-5069 code for article on new features in the Java 16 incremental… (#11176) 

* BAEL-5069 code for article on new features in the Java 16 incremental release

* BAEL-5069 added some details around Vector API example and enable-preview in maven to allow package to build

Co-authored-by: Liam Garvie <liamgarvie@Liams-MacBook-Pro.local>
This commit is contained in:
LiamGve 2021-09-22 08:33:17 +01:00 committed by GitHub
parent 2086ac5fc3
commit 861a8e19a4
16 changed files with 261 additions and 1 deletions
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35
core-java-modules/core-java-16/pom.xml
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@ -28,6 +28,18 @@
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</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>
@ -37,17 +49,38 @@
<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>16</maven.compiler.source.version>
<maven.compiler.target.version>16</maven.compiler.target.version>
<assertj.version>3.6.1</assertj.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>

7
core-java-modules/core-java-16/src/main/java/com/baeldung/features/HelloWorld.java Normal file
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@ -0,0 +1,7 @@
package com.baeldung.features;
interface HelloWorld {
default String hello() {
return "world";
}
}

9
core-java-modules/core-java-16/src/main/java/com/baeldung/features/OuterClass.java Normal file
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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");
}
}

23
core-java-modules/core-java-16/src/main/java/com/baeldung/features/VectorExample.java Normal file
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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;
}
}

44
core-java-modules/core-java-16/src/main/java/com/baeldung/features/model/Book.java Normal file
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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);
}
}

4
core-java-modules/core-java-16/src/main/java/com/baeldung/features/record/Book.java Normal file
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@ -0,0 +1,4 @@
package com.baeldung.features.record;
public record Book(String title, String author, String isbn) {
}

4
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/JungleAnimal.java Normal file
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@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public sealed interface JungleAnimal permits Monkey, Snake {
}

4
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Monkey.java Normal file
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@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public final class Monkey implements JungleAnimal {
}

13
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Sealed.java Normal file
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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
}
}
}

4
core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Snake.java Normal file
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@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public non-sealed class Snake implements JungleAnimal {
}

4
core-java-modules/core-java-16/src/main/java/module-info.java Normal file
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@ -0,0 +1,4 @@
module core.java {
requires jdk.incubator.vector;
requires org.apache.commons.lang3;
}

24
core-java-modules/core-java-16/src/test/java/com/baeldung/features/DayPeriodSupportUnitTest.java Normal file
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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");
}
}

28
core-java-modules/core-java-16/src/test/java/com/baeldung/features/HelloWorldUnitTest.java Normal file
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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");
}
}

18
core-java-modules/core-java-16/src/test/java/com/baeldung/features/InstanceOfPatternMatchingUnitTest.java Normal file
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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);
}
}
}

20
core-java-modules/core-java-16/src/test/java/com/baeldung/features/StreamToListUnitTest.java Normal file
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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);
}
}

21
core-java-modules/core-java-16/src/test/java/com/baeldung/features/VectorExampleUnitTest.java Normal file
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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);
}
}