对List排序

package com.huawei.kong;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;public class ListSortTest{/** * @param args */public static void main(String[] args){List<User> userlist = new ArrayList<User>();userlist.add(new User("dd", "4"));userlist.add(new User("aa", "1"));userlist.add(new User("ee", "5"));userlist.add(new User("bb", "2"));userlist.add(new User("ff", "5"));userlist.add(new User("cc", "3"));userlist.add(new User("gg", "6"));ComparatorUser comparator = new ComparatorUser();Collections.sort(userlist, comparator);for (int i = 0; i < userlist.size(); i++){User user_temp = (User) userlist.get(i);System.out.println(user_temp.getAge() + "," + user_temp.getName());}}}class User{String name;String age;public User(String name, String age){this.name = name;this.age = age;}public String getAge(){return age;}public void setAge(String age){this.age = age;}public String getName(){return name;}public void setName(String name){this.name = name;}}class ComparatorUser implements Comparator<User>{public int compare(User user0, User user1){// 首先比较年龄，如果年龄相同，则比较名字int flag = user0.getAge().compareTo(user1.getAge());if (flag == 0){return user0.getName().compareTo(user1.getName());}else{return flag;}}}