hashCode()与toString()

 1 class User{
 2     String name;
 3     int age;
 4  
 5     public User(String name,int age){
 6         this.name = name;
 7         this.age  = age;
 8     }
 9 
10     public String toString(){
11         String result = "age:" +age+ "," +"name:" +name;
12         return result;
13     }     
14 }

1 import java.util.*;
2 
3 class Test{
4     public static void main(String args []){
5         User u = new User("zhangsan",12);
6 
7         System.out.println(u);    
8     }
9 }