In Java, Equals and Hashcode also have the ToString Method learning record

Package javas.fristdome01;

Import Org.testng.annotations.Test;

Class Person {

private String name;

private int age;

Person () {

}

Person (String name, int age) {

THIS.name = name;

This.age = age;

}

Public String GetName () {

return name;

}

public void SetName (String name) {

THIS.name = name;

}

public int getage () {

return age;

}

public void Setage (int.) {

This.age = age;

}

/**

* If you do not write the ToString method, the Hascode will be generated.

* ToString (); Indicates the string description of the object

*

*/

@Override

Public String toString () {

TODO auto-generated Method Stub

Return "Name:" +this.getname () + ". Age" +this.getage ();

}

@Override

public boolean equals (Object obj) {

TODO auto-generated Method Stub

if (obj instanceof person)

{

Person P = (person) obj;

if (This.getname (). Equals (P.getname ()) && (This.getage () ==p.getage ()))

{

return true;

}else

{

return false;

}

}else

{

return false;

}

}

@Override

public int hashcode () {

TODO auto-generated Method Stub

Return This.getname (). Hashcode () +this.getage ();

}

}

public class Objcetdome {

@Test

public void TST ()

{

person P1 = new Person ("Zhang Shan", 20);

System.out.println (p1); Output 16 Binary

person P2 = new Person ("Zhang Shan", 20);

System.out.println ("Hascode of the object of the P1:" +p1.hashcode ());//output is a decimal data

System.out.println ("Hascode of the object of the P1:" +p2.hashcode ());//output is a decimal data

System.out.println ("-----------------------");

System.out.println (P1 = = p2);

System.out.println ("Two objects are equal:" +p1.equals (p2));

}

}

/** Pre-condition does not override the ToString () method

* Person P1 = new Person ("Zhang Shan", 20);

System.out.println (p1);

* [Email protected]-this is Hascode

* If two objects equals the same, their hashcod are the same

* [Email protected]--output 16 binary

The hasCode1585787493 of the P1 object--The output is the decimal data

*

* equals determines whether the content is equal. The default is to determine whether Hascode want to wait

* If you override Equals, you must also override the Hashcode method

*

*

* */

=======================

Name: Zhang Shan. Age 20

The hascode:778597 of P1 objects

The hascode:778597 of P1 objects

-----------------------

False

Two objects are equal: true

Passed:tst

In Java, Equals and Hashcode also have the ToString Method learning record