18.java hashcode和equals

class Person extends Object{

 private String name;

 private int age;

 public Person(String name,int age){

   this.name=name;

   this.age=age;

 }

 public int hashCode(){

  return this.name.hashCode()^ new Integer(this.age).hashCode();

 }

 public boolean equals(Object obj){

  if(obj==null){

   return false;

  }

  if(this==obj){

   return true;

  }

  if(!(obj instanceof Person)){

   return false;                      

  }

  Person p=(Person)obj;

  return this.name.equals(p.name)?(this.age==p.age):false;

 }

 public String toString(){

  return this.name+":"+this.age;

 }

}

class Demo92{

 public static void main(String[] args){

  Person p1=new Person("张三",20);

  Person p2=new Person("张三",20);

  System.out.println("p1==p2的值："+(p1==p2));//false

  System.out.println("p1.equals(p2)的值："+p1.equals(p2));

  int hashCode1=p1.hashCode();

  int hashCode2=p2.hashCode();

  System.out.println("p1.hashCode="+hashCode1);

  System.out.println("p2.hashCode="+hashCode2);

  System.out.println("p1="+p1);

  System.out.println("p2="+p2);

 }

}