java 对象的比较操作

class Person{
    private String name;
    private int age;
    public Person(String name,int age){
        this.name=name;
        this.age=age;
    }
    public boolean equals(Object obj){
        if(this==obj)//地址相等？
            return true;
        if(!(obj instanceof Person))//判断是否为Person的实例
            return false;
        Person per=(Person)obj;
        if(per.name.equals(this.name)&&per.age==this.age){
            return true;
        }
        else{
            return false;
        }
    }
}
public class ObjectDemo {
    public static void main(String[] args) {
        Person per1=new Person("李新华 ",30);
        Person per2=new Person("李新华 ",30);
        System.out.println(per1.equals(per2)?"同":"不同");
        System.out.println(per1.equals("hello")?"同":"不同");
    }

}