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| • Inheritance and polymorphism are powerful language features to develop
extensible and modifiable code. • Inheritance mechanism is used to share common code among the related classes. • Inheritance is different from the Java interface, which is used to share common behavior among unrelated classes. • The third visibility modifier is the protected modifier. • If no instances are created from a superclass, then define the superclass as an abstract class. • Polymorphic messages tell us that the method executed in response to the message will vary according to the class to which the object belongs. • The first statement in a constructor of a subclass must be a call to a constructor of the superclass. If the required statement is not made explicitly, then the statement to call the default constructor of the superclass is inserted automatically by the Java compiler. • The standard class described or used in this chapter is StringTokenizer. |