对list排序

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最新推荐文章于 2024-04-16 10:59:23 发布

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Collections.sort()对List排序

2010-08-03 10:08

import java.util.Comparator;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

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{

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;
   }
}

}

public class SortTest {

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"));

   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());
   }

}
}

//首先比较年龄，如果年龄相同，则比较名字

结果:
   1, aa
   2, bb
   3, cc
   4, dd
   5, ee
   5, ff
   6, gg