Using the class's static fields and constructors, we can track the number of objects created by a class. Write a class that can query it at any time "how many objects have you created?" ”。

Sample Program :

Import Java.util.Scanner;

Class A

{

public static int id=0;

Public A ()

{

id++;

System.out.println (" Create a" +id+ " object ");

}

}

public class Test

{

public static void Main (string[] args)

{

while (1>0)

{

A obj=new a ();

System.out.println (" Please select 1. continue creating Objects 2. End ");

Scanner sc=new Scanner (system.in);

int I=sc.nextint ();

if (i==2)

{

Break

}

}

}

}

Operation Result:

Create a 1 Object

Please select 1. continue creating Objects 2. End

1

Create a 2 Object

Please select 1. continue creating Objects 2. End

1

Create a 3 Object

Please select 1. continue creating Objects 2. End

1

Create a 4 Object

Please select 1. continue creating Objects 2. End

2

Using the class's static fields and constructors, we can track the number of objects created by a class. Write a class that can query it at any time "how many objects have you created?" ”。