How does creating a instance of class inside of the class itself works?

Question

What makes it possible to create a instance of class inside of the class itself?

public class My_Class
 {

      My_Class new_class= new My_Class();
 }
         


        

Answer 1

The attribute to hold self instance should be static

public class MyClass {

    private static MyClass instance;

    static {
        instance = new MyClass();
    }

    // some methods

}