CollectionFeatures.java

package java11;

import org.junit.Test;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Set;

public class CollectionFeatures {

    /**
     * In Java 11 allows the collection's elements to be transferred to constantClass newly created array of the desired runtime type.
     */
    @Test
    public void copyIntoNewArray() {
        final var numbers = Set.of(1, 2, 3, 4);
        var intArray = numbers.toArray(Integer[]::new);
        System.out.println(Arrays.toString(intArray));

        final var words = Set.of("hello", "copy", "array", "java");
        var stringArray = words.toArray(String[]::new);
        System.out.println(Arrays.toString(stringArray));

        Object[] objects = words.toArray();
        System.out.println(Arrays.toString(objects));

        var stringArray2 = words.toArray(String[]::new);
        System.out.println(Arrays.toString(stringArray2));

    }


}