Polymorphism - Java

/*==================================================================================================
  --------------------------------------------------------------------------------------------------
  [Polymorph.java]
  Polymorphism at work.

        (c) Damion 'Phr0z3n.dev' Tapper, 2015.
        Email: [email protected]
        Website: L337Stuff.Blogspot.com
  --------------------------------------------------------------------------------------------------
  ==================================================================================================*/
public class Polymorph
{
    public static void main(String arg[])
    {
        new Polymorph().ShowTypes();
    }

    public void ShowTypes()
    {
        MyCanvas    myCanvas = new MyCanvas();

            if(myCanvas instanceof MyCanvas)
                System.out.println("myCanvas is a MyCanvas");
            if(myCanvas instanceof java.awt.Canvas) // Parent of MyCanvas
                System.out.println("myCanvas is a java.awt.Canvas");
            if(myCanvas instanceof java.awt.Component) // Grand parent of MyCanvas
                System.out.println("myCanvas is a java.awt.Component");
            if(myCanvas instanceof java.lang.Object) // Great Grand parent (of everyone in the Java family)...
                System.out.println("myCanvas is a java.lang.Object");
            if(myCanvas instanceof java.lang.Runnable) // Some other ancestor of MyCanvas
                System.out.println("myCanvas is a java.lang.Runnable");
            if(myCanvas instanceof javax.accessibility.Accessible)
                System.out.println("myCanvas is a javax.accessibility.Accessible");
            if(myCanvas instanceof java.awt.image.ImageObserver)
                System.out.println("myCanvas is a java.awt.image.ImageObserver");
            if(myCanvas instanceof java.awt.MenuContainer)
                System.out.println("myCanvas is a java.awt.MenuContainer");
            if(myCanvas instanceof java.io.Serializable)
                System.out.println("myCanvas is a java.io.Serializable");

        java.awt.Canvas         jaCanvas = myCanvas; // NOTE: No way to fool Java about what its types are... people have tried and all they got were exceptions.
        java.lang.Runnable      jlRun = myCanvas; // interface treated like class
        java.awt.MenuContainer  jaMenuContainer = new MyCanvas();
        java.awt.Canvas         jac = (java.awt.Canvas)jaMenuContainer;
        /**
         * NOTE:
         * If you are making an assignment in the direction such that the compiler can't be positive
         * it will always be correct, you will have to cast it.
         **/

        /**
         * NOTE:
         * The MyCanvas class completely inherits the implementation of all interfaces by all super-classes
         * just as if they have been implemented locally.
         *
         * NOTE TO SELF:
         * Polymorphism at its best. ;)
         *
         * DEFINE 'polymorphism':
         * The third pillar of the Object-Oriented Programming (OOP) paradigm, after 'encapsulation'
         * and 'inheritance' (and a central characteristic).
         **/
    }
}

class MyCanvas extends java.awt.Canvas implements Runnable
{
    public void run()
    {
    }
}