java List集合中根据集合对象的属性值进行排序

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//进行排序的实体对象

package com.compile;

public class User {
   String name;
   String age;

   public User(String name,String age){
      this.name=name;
      this.age=age;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getAge() {
       return age;
   }

   public void setAge(String age) {
       this.age = age;
   }

}

//用于排序处理的实体类，可以根据具体的属性参数和降序升序参数来动态处理list集合对象的数据

package com.compile;

import java.util.Comparator;

public class ComparatorUser implements Comparator{
   public int paramType;
   public int sortType;


   public int getSortType() {
       return sortType;
   }

   public void setSortType(int sortType) {
       this.sortType = sortType;
   }

   public int getParamType() {
       return paramType;
   }

   public void setParamType(int paramType) {
       this.paramType = paramType;
   }

   public ComparatorUser(int paramType,int sortType) {
       super();
       this.paramType = paramType;
       this.sortType = sortType;
   }

   public int compare(Object obj0, Object obj1) {
          User user0=(User)obj0;
          User user1=(User)obj1;
          int flag = 0;
          String msg="";
          if(paramType==0){
              msg="年龄";
              if(sortType==0){//升序
                  flag = user0.getAge().compareTo(user1.getAge());
              }else if(sortType==1){//降序
                  flag = user1.getAge().compareTo(user0.getAge());
              }
          }
          if(paramType==1){
              msg="姓名";
              if(sortType==0){//升序
                  flag = user0.getName().compareTo(user1.getName());
              }else if(sortType==1){//降序
                  flag = user1.getName().compareTo(user0.getName());
              }
          }
          System.out.println("根据："+msg+"----排序");
           return flag;
       }
}

//测试方法

package com.compile;

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

public class TestUserSort {
   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"));
          //根据年龄降序排序
          ComparatorUser comparator=new ComparatorUser(0,1);
          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());
          }
   }

}

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