Section 10.4 Abstract Classes and Methods
• Abstract classes (p. 401) cannot be used to instantiate objects, because they’re incomplete.
• The primary purpose of an abstract class is to provide an appropriate superclass from which other classes can inherit and thus share a common design.
• Classes that can be used to instantiate objects are called concrete classes (p. 402). They provide implementations of every method they declare (some of the implementations can be inherited).
• Programmers often write client code that uses only abstract superclasses (p. 402) to reduce client code’s dependencies on specific subclass types.
• Abstract classes sometimes constitute several levels of a hierarchy.
• An abstract class normally contains one or more ...
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