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>

core-java-modules/core-java-16/src/main/java/com/baeldung/features/HelloWorld.java

@@ -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

@@ -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

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+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

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+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

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+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

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+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

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+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

@@ -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

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+package com.baeldung.features.sealed;
+
+public non-sealed class Snake implements JungleAnimal {
+}

core-java-modules/core-java-16/src/main/java/module-info.java

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+module core.java {
+    requires jdk.incubator.vector;
+    requires org.apache.commons.lang3;
+}