W3School TIY Editor

import java.util.ArrayList; import java.util.function.Consumer; public class Main { public static void main(String[] args) { ArrayList<Integer> numbers = new ArrayList<Integer>(); numbers.add(5); numbers.add(9); numbers.add(8); numbers.add(1); Consumer<Integer> method = (n) -> { System.out.println(n); }; numbers.forEach( method ); } }