How to proof that main method will called without creating the instance of Class?

1. Using Instance Initializer block

Instance Initializer block is used to initialize the instance data member. It runs each time when object of the class is created.

public class MainMethodTest {

     /** Instance block called while creating the Object. */

     {

           System.out.println("Inside Instance Initializer block!!");

     }

    

     public static void main(String[] args) {

           System.out.println("Main method executed!!");

     }

}

Output:

Main method executed!!

In above program, there is main() method along with Instance Initializer block. The Instance Initializer block is not called while executing the main method which proves that the class is not initialised while executing the main method.

2. By using abstract keyword

We cannot create the instance of an abstract class. Because it's abstract and an object is concrete. An abstract class is sort of like a template, or an empty/partially empty structure, you have to extend it and build on it before you can use it.

public abstract class MainMethodTest {

    

     public static void main(String[] args) {

           System.out.println("Main method executed!!");

     }

}

Output:

Main method executed!!

However we are able to execute the main method inside the abstract class which proves that there is no need to create the object while executing the main method.

3. Using Constructor

A default (no-argument) constructor is called while creating the object of any class.

public abstract class MainMethodTest {

    

     public MainMethodTest() {

           System.out.println("Constructor MainMethodTest!!");

     }

    

     public static void main(String[] args) {

           System.out.println("Main method executed!!");

     }

}

Output: Main method executed!!

The constructor is not called while executing main method. Hence the instance of class is not created while execution of main method.