java 对象的比较操作

 1 class Person{
 2     private String name;
 3     private int age;
 4     public Person(String name,int age){
 5         this.name=name;
 6         this.age=age;
 7     }
 8     public boolean equals(Object obj){
 9         if(this==obj)//地址相等？
10             return true;
11         if(!(obj instanceof Person))//判断是否为Person的实例
12             return false;
13         Person per=(Person)obj;
14         if(per.name.equals(this.name)&&per.age==this.age){
15             return true;
16         }
17         else{
18             return false;
19         }
20     }
21 }
22 public class ObjectDemo {
23     public static void main(String[] args) {
24         Person per1=new Person("李新华 ",30);
25         Person per2=new Person("李新华 ",30);
26         System.out.println(per1.equals(per2)?"同":"不同");
27         System.out.println(per1.equals("hello")?"同":"不同");
28     }
29 
30 }