interface MyInterface {

}

public class MyInstanceTest implements MyInterface {

    static String s;

    public static void main(String args[]) {

        MyInstanceTest t = new MyInstanceTest();

        if (t instanceof MyInterface) {

            System.out.println("I am true interface");

        } else {

            System.out.println("I am false interface");

        }

        if (s instanceof String) {

            System.out.println("I am true String");

        } else {

            System.out.println("I am false String");

        }

    }

}

output:

I am true interface
I am false String

this is quite confusing.

see  the code...
 if (t instanceof MyInterface)
 t is not polymorphically created even .....its a damn instance of
MyInstanceTest  class .
i dont understand how its going to become an instance of MyInterface
and the output "I am    true interface"

this would have been if we had the code like this..

        MyInterface t = new MyInstanceTest();  // but its not here

And about the String class  see the code...
if (s instanceof String)

is this if block is false because of s is not created via new operator
?

Please explain