package com.zetcode; import java.util.Arrays; import java.util.Collections; import java.util.List; public class JavaLambdaEx5 { public static void main(String[] args) { List users = Arrays.asList( new User("Joe", "[email protected]"), new User("Pete", "[email protected]"), new User("Robert", "[email protected]") ); Collections.sort(users, (a, b) -> a.getName().compareToIgnoreCase(b.getName())); System.out.println(users); Collections.sort(users, (a, b) -> a.getEmail().compareToIgnoreCase(b.getEmail())); System.out.println(users); } }