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- An extended class can be used wherever the original class was legal.
- Polymorphism - an object of a given class can have multiple forms.
- The extended class is a subclass.
- The class it extends is the superclass.
- If a class does not explicitly extend a class then it implicitly extends Object.
- Object declares methods that are implemented by all objects.
Next: A simple example
Up: Extending Classes
Previous: Objectives
Contents