Java 8 forEach() Set Example

Java HashSet Examples


Java 8 provides a new method forEach() to iterate the elements. It is defined in the Iterable and Stream interface.

It is a default method defined in the Iterable interface. Collection classes that extend the Iterable interface can use the forEach() loop to iterate elements.

Java 8 forEach() method with Set Example

The below example shows how to use the forEach method with Set collection, stream, etc.
public static void forEachWithSet() {

    final Set < String > items = new HashSet < > ();
    items.add("A");
    items.add("B");
    items.add("C");
    items.add("D");
    items.add("E");

    // before java 8
    for (final String item: items) {
        System.out.println(item);
    }

    // java 8 with lambda expression
    //Output : A,B,C,D,E
    items.forEach(item - > System.out.println(item));

    //Output : C
    items.forEach(item - > {
        if ("C".equals(item)) {
            System.out.println(item);
        }
    });

    //method reference
    items.forEach(System.out::println);

    //Stream and filter
    items.stream()
        .filter(s - > s.contains("B"))
        .forEach(System.out::println);

}

Reference



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