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chapter 2 Object orienation polymorphism

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by Katherine Sierra (Author), Bert Bates (Author)

chapter 2:object orienation

even though the compiler
only knows about the declared reference type, the Java Virtual Machine (JVM)
at runtime knows what the object really is. And that means that even if the
PlayerPiece object's displayShape() method is called using a GameShape
reference variable, if the PlayerPiece overrides the displayShape() method, the
JVM will invoke the PlayerPiece version! The JVM looks at the real object at the
other end of the reference, "sees" that it has overridden the method of the declared
reference variable type, and invokes the method of the object's actual class

can anyone illustrate with an example
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well you will get all this in the next part of the book in the Overriding and overloading section
this is the example I have tried in the book hope this helps

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