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• This method will not return anything.
• This method will take lambda expression as argument and apply that lambda expression for each element present in the stream.

For example,

l.stream().forEach(s->System.out.println(s));
l3.stream().forEach(System.out::println);

Let's see another example,

import java.util.Arrays;
import java.util.List;

public class ForEachDemo {

public static void main(String args[]) {
    withoutForEach();
    withForEach();
}

private static void withoutForEach() {
    System.out.println("From withoutForEach");

    List<Integer> intList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
    for (int i : intList) {
        System.out.println(i);
    }
    }

    private static void withForEach() {
        System.out.println("From withForEach");
        List<Integer> intList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
        intList.forEach(System.out::println);
    }

}

Output

From withoutForEach
1
2
3
4
5
6
7
8
9
From withForEach
1
2
3
4
5
6
7
8
9