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davidmartinezbaruadavidmartinezbarua
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Merge pull request eugenp#11363 from thiagohora/BAEL-5197/new_features_in_javav17
[BAEL-5197] New Features in Java 17
2 parents b5a2c9b + 8953802 commit 26d1234

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14 files changed

+371
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‎core-java-modules/core-java-17/pom.xml‎

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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<target>${maven.compiler.target.version}</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>${surefire.plugin.version}</version>
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<configuration>
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<argLine>--enable-preview</argLine>
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<forkCount>1</forkCount>
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</configuration>
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<dependencies>
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<dependency>
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<groupId>org.apache.maven.surefire</groupId>
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<artifactId>surefire-api</artifactId>
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<version>${surefire.plugin.version}</version>
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</dependency>
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</dependencies>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>${surefire.plugin.version}</version>
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<configuration>
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<argLine>--enable-preview</argLine>
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<argLine>--enable-native-access=core.java</argLine>
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<forkCount>1</forkCount>
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</configuration>
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<dependencies>
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<dependency>
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<groupId>org.apache.maven.surefire</groupId>
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<artifactId>surefire-api</artifactId>
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<version>${surefire.plugin.version}</version>
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</dependency>
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</dependencies>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.source.version>17</maven.compiler.source.version>
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<maven.compiler.target.version>17</maven.compiler.target.version>
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<maven.compiler.release>17</maven.compiler.release>
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<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
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<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
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<assertj.version>3.17.2</assertj.version>
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<maven.compiler.release>17</maven.compiler.release>
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<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
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<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
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<assertj.version>3.17.2</assertj.version>
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</properties>
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</project>

‎core-java-modules/core-java-17/src/main/java/com/baeldung/features/JEP356.java‎

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package com.baeldung.features;
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import java.util.random.RandomGeneratorFactory;
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import java.util.stream.IntStream;
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import java.util.stream.Stream;
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public class JEP356 {
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public Stream<String> getAllAlgorithms() {
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return RandomGeneratorFactory.all().map(RandomGeneratorFactory::name);
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}
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public IntStream getPseudoInts(String algorithm, int streamSize) {
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// returns an IntStream with size @streamSize of random numbers generated using the @algorithm
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// where the lower bound is 0 and the upper is 100 (exclusive)
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return RandomGeneratorFactory.of(algorithm)
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.create()
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.ints(streamSize, 0,100);
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}
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/features/JEP406.java‎

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package com.baeldung.features;
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import com.baeldung.features.JEP409.Circle;
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import com.baeldung.features.JEP409.Shape;
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import com.baeldung.features.JEP409.Triangle;
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public class JEP406 {
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static record Human (String name, int age, String profession) {}
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public String checkObject(Object obj) {
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return switch (obj) {
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case Human h -> "Name: %s, age: %s and profession: %s".formatted(h.name(), h.age(), h.profession());
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case Circle c -> "This is a circle";
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case Shape s -> "It is just a shape";
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case null -> "It is null";
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default -> "It is an object";
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};
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}
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public String checkShape(Shape shape) {
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return switch (shape) {
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case Triangle t && (t.getNumberOfSides() != 3) -> "This is a weird triangle";
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case Circle c && (c.getNumberOfSides() != 0) -> "This is a weird circle";
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default -> "Just a normal shape";
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};
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}
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/features/JEP409.java‎

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package com.baeldung.features;
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public class JEP409 {
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sealed interface Shape permits Rectangle, Circle, Square, Triangle {
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int getNumberOfSides();
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}
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static final class Rectangle implements Shape {
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@Override
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public int getNumberOfSides() {
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return 4;
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}
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}
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static final class Circle implements Shape {
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@Override
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public int getNumberOfSides() {
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return 0;
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}
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}
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static final class Square implements Shape {
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@Override
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public int getNumberOfSides() {
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return 4;
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}
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}
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static non-sealed class Triangle implements Shape {
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@Override
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public int getNumberOfSides() {
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return 3;
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}
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}
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}

‎core-java-modules/core-java-17/src/main/java/com/baeldung/features/JEP412.java‎

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package com.baeldung.features;
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import jdk.incubator.foreign.CLinker;
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import jdk.incubator.foreign.FunctionDescriptor;
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import jdk.incubator.foreign.MemoryAddress;
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import jdk.incubator.foreign.SymbolLookup;
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import java.io.IOException;
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import java.lang.invoke.MethodType;
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import static jdk.incubator.foreign.ResourceScope.newImplicitScope;
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public class JEP412 {
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private static final SymbolLookup libLookup;
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static {
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var resource = JEP412.class.getResource("/compile_c.sh");
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try {
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var process = new ProcessBuilder("sh", resource.getPath()).start();
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while (process.isAlive()) {}
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} catch (IOException ex) {
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throw new RuntimeException(ex);
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}
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var path = JEP412.class.getResource("/print_name.so").getPath();
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System.load(path);
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libLookup = SymbolLookup.loaderLookup();
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}
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public String getPrintNameFormat(String name){
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var printMethod = libLookup.lookup("printName");
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if (printMethod.isPresent()) {
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var methodReference = CLinker.getInstance()
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.downcallHandle(
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printMethod.get(),
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MethodType.methodType(MemoryAddress.class, MemoryAddress.class),
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FunctionDescriptor.of(CLinker.C_POINTER, CLinker.C_POINTER)
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);
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try {
44+
var nativeString = CLinker.toCString(name, newImplicitScope());
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var invokeReturn = methodReference.invoke(nativeString.address());
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var memoryAddress = (MemoryAddress) invokeReturn;
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return CLinker.toJavaString(memoryAddress);
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} catch (Throwable throwable) {
49+
throw new RuntimeException(throwable);
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}
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}
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throw new RuntimeException("printName function not found.");
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}
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}
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‎core-java-modules/core-java-17/src/main/java/com/baeldung/features/JEP414.java‎

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package com.baeldung.features;
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import jdk.incubator.vector.FloatVector;
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import jdk.incubator.vector.VectorSpecies;
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public class JEP414 {
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private static final VectorSpecies<Float> SPECIES = FloatVector.SPECIES_PREFERRED;
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public void newVectorComputation(float[] a, float[] b, float[] c) {
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for (var i = 0; i < a.length; i += SPECIES.length()) {
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var m = SPECIES.indexInRange(i, a.length);
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var va = FloatVector.fromArray(SPECIES, a, i, m);
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var vb = FloatVector.fromArray(SPECIES, b, i, m);
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var vc = va.mul(vb);
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vc.intoArray(c, i, m);
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}
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}
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public void commonVectorComputation(float[] a, float[] b, float[] c) {
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for (var i = 0; i < a.length; i ++) {
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c[i] = a[i] * b[i];
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}
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}
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}

‎core-java-modules/core-java-17/src/main/java/module-info.java‎

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module core.java {
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requires jdk.incubator.vector;
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requires jdk.incubator.foreign;
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}

‎core-java-modules/core-java-17/src/main/resources/compile_c.sh‎

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#!/bin/bash
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SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
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gcc -c -fPIC $SCRIPTPATH/print_name.c
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gcc -shared -rdynamic -o print_name.so print_name.o
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mv print_name.so $SCRIPTPATH/
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mv print_name.o $SCRIPTPATH/

‎core-java-modules/core-java-17/src/main/resources/print_name.c‎

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#include<stdio.h>
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#include<stdlib.h>
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char* printName(char *name) {
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char* newString = (char*)malloc((15 + sizeof(name))*sizeof(char));
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sprintf(newString, "Your name is %s", name);
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return newString;
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}

‎core-java-modules/core-java-17/src/test/java/com/baeldung/features/JEP356UnitTest.java‎

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package com.baeldung.features;
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import org.junit.jupiter.api.Test;
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import static org.assertj.core.api.Assertions.assertThat;
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public class JEP356UnitTest {
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@Test
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void getPseudoInts_whenUsingAlgorithmXoroshiro128PlusPlus_shouldReturnStreamOfRandomInteger() {
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var algorithm = "Xoshiro256PlusPlus";
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var streamSize = 100;
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JEP356 jep356 = new JEP356();
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jep356.getPseudoInts(algorithm, streamSize)
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.forEach(value -> assertThat(value).isLessThanOrEqualTo(99));
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}
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}

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