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superclass use a method of its subclass?

 
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Can a Superclass use a method of its subclass if yes how.....?
 
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Read about Java Inheritance, its fairly straightforward what the answer is though
 
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How would a superclass know which sub-class method to use? Or if there even is a sub-class?

I am assuming you are talking about creating an instance of the superclass, not simply using a super-class reference variable that it pointing to a subclass instance.
 
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