/* ============================================================
   Demo using interface variable
   ============================================================ */   

public class Demo
{
    public static void main(String[] args)
    {
	myInterface a;

	// This is an UPCASTING operation: myInterface is a parent class !
        a = new myClass();   	 	 // Upcasting !
        a.myMethod();			 // Polymorphism !

        // This shows you that an interface is a superclass !!!
        a = new myClass2();  		 // Upcasting !
        a.myMethod();                    // Polymorphism !
    }
}