4 ABSTRACT PARENT CLASS
This pattern was previously described in Grand98.
DESCRIPTION
The Abstract Parent Class pattern is useful for designing a framework for the consistent implementation of functionality common to a set of related classes.
An abstract method is a method that is declared, but contains no implementation. An abstract class is a class with one or more abstract methods. Abstract methods, with more than one possible implementation, represent variable parts of the behavior of an abstract class. An abstract class may contain implementations for other methods, which represent the invariable parts of the class functionality.
Different subclasses may be designed when the functionality outlined by abstract methods in an abstract class ...
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