数据库查询集合排序

/*
 * 定义一个排序规则
 */
public class ComparatorUser implements Comparator{

    @Override
    public 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()+"	"); 
              }
          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()); 
          }
          
         }