import org.junit.Test; import java.util.Arrays; import java.util.Collections; import java.util.LinkedList; import java.util.List; /** * @author clayoverwind * @version 2017/4/7 * @E-mail [email protected] */ public class ApplicationTest { @Test public void testLeetCode() { List list = new LinkedList<>(Arrays.asList(5,2,4,6,1,3,5,6,21,4,6,2)); Collections.sort(list, (a, b) -> a.compareTo(b)); Collections.sort(list, (a, b) ->{return a.compareTo(b);}); Collections.sort(list, (Integer a, Integer b) ->{return a.compareTo(b);}); System.out.println(list); } }