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;
  //首先比較年齡，如果年齡相同，則比較名字
  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.getName()+","+user_temp.getAge()); 
  }
  
 }
}


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