/** 定义一个排序规则*/
public class ComparatorUser implements Comparator{@Overridepublic int compare(Object arg0, Object arg1) {User user0=(User)arg0;User user1=(User)arg1;//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;} }
}
/**排序与打印*/
public static void main(String[] args){List userlist=new ArrayList();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"));for (int i=0;i<userlist.size();i++){User user_temp=(User)userlist.get(i);System.out.print(user_temp.getAge()+"/"+user_temp.getName()+"\t"); }System.out.println();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()); }}
)
