Section 9.1 Introduction
• Inheritance (p. 361) reduces program-development time.
• The direct superclass (p. 361) of a subclass is the one from which the subclass inherits. An indirect superclass (p. 361) of a subclass is two or more levels up the class hierarchy from that subclass.
• In single inheritance (p. 361), a class is derived from one superclass. In multiple inheritance, a class is derived from more than one direct superclass. Java does not support multiple inheritance.
• A subclass is more specific than its superclass and represents a smaller group of objects (p. 361).
• Every object of a subclass is also an object of that class’s superclass. However, a superclass object is not an object of its class’s subclasses.
• An is-a relationship ...
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