How to Print How Many Objects are Created in Java?

You can track the number of objects created in Java using a static counter variable within your class. Here's how:

1. Declare a Static Counter:

   • Inside your class, declare a static variable of type int to keep track of the object count.
   • Initialize it to 0.

   public class MyClass {
       private static int objectCount = 0;

2. Increment the Counter in the Constructor:

   • In the class's constructor, increment the objectCount variable by 1.

   public MyClass() {
       objectCount++;
   }

3. Create a Getter Method:

   • Create a static method to return the current value of objectCount.

   public static int getObjectCount() {
       return objectCount;
   }

4. Print the Object Count:

   • Call the getObjectCount() method to retrieve the object count and print it.

   public static void main(String[] args) {
       MyClass obj1 = new MyClass();
       MyClass obj2 = new MyClass();
       System.out.println("Number of objects created: " + MyClass.getObjectCount()); 
   }

Example:

public class MyClass {
    private static int objectCount = 0;

    public MyClass() {
        objectCount++;
    }

    public static int getObjectCount() {
        return objectCount;
    }

    public static void main(String[] args) {
        MyClass obj1 = new MyClass();
        MyClass obj2 = new MyClass();
        System.out.println("Number of objects created: " + MyClass.getObjectCount()); // Output: 2
    }
}

This approach provides a simple way to track the number of objects created for a specific class in your Java program.