Basic HTML version of Foils prepared June 5 99

Foil 47 Inheritance (the subclass relationship)

From Java Language in the Computer Science Curriculum ADMI Tutorial Duluth Minnesota -- June 3 99. by Geoffrey C. Fox
1 In the Java class header, we put B extends A which means B is a subclass of A, if B has all the variables and methods of A (and more).
2 In the class definition of B, the child class, there is no need to repeat declarations of variables and methods of A, they are assumed to be there. The definition of B has the additional variables and methods of B.
3 Or B may give a new definition of some method of A. This is called overriding.
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