1 package new_start1;
 2 public class Test1 {
 3     class Person
 4     {
 5         public String name;
 6         public Person(String n)
 7         {
 8             this.name=n;
 9         }
10         public Person(){}
11     }
12     public static void change(Person a)//改变对象a的name值
13     {
14         a.name="haha";
15     }
16     public static void main(String[] args) {
17         Test1 t=new Test1();
18         Person p=t.new Person("zhangsan"); //实例一个对象p
19         Person a=t.new Person();//又实例一个对象a
20         System.out.println("未赋值前，两者的哈希码是不相同的:");
21         System.out.println("a.hashCode="+a.hashCode()+"  "+"p.hashCode="+p.hashCode());
22         System.out.println("a.toString()="+a.toString());
23         System.out.println("p.toString()="+p.toString());
24         /*
25             未赋值前，两者的哈希码是不相同的:
26             a.hashCode=366712642  p.hashCode=1829164700
27             a.toString()=new_start1.Test1$Person@15db9742
28             p.toString()=new_start1.Test1$Person@6d06d69c
29          */
30         a=p;
31         System.out.println("赋值后，两者的哈希码相同:");
32         System.out.println("a.hashCode="+a.hashCode()+"  "+"p.hashCode="+p.hashCode());
33         System.out.println("a.toString()="+a.toString());
34         System.out.println("p.toString()="+p.toString());
35         /*
36              赋值后，两者的哈希码相同:
37             a.hashCode=1829164700  p.hashCode=1829164700
38             a.toString()=new_start1.Test1$Person@6d06d69c
39             p.toString()=new_start1.Test1$Person@6d06d69c
40          */
41     }
42 }