Method Reference in Java 8

import java.util.ArrayList;

import java.util.List;

public class MethodReference {

       public static void main(String[] args) {

              List strings = new ArrayList<>();      

              strings.add("actor");

              strings.add("bat");

              strings.add("do");

              strings.add("i");         

              strings.sort(String::compareTo);

              strings.forEach(System.out::println);

       }

}

Output:

actor

bat

do

i