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Inheritance
is the way to model this “subset” relationship.
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A
class, called a subclass or derived class inherits from a
class (a
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superclass,
parent, or base class), if its objects form a subset of the
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base
class objects
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The
objects in the subclass must support all operations that are
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supported
by the superclass, but they may carry out these
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operations
in a special way.
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They
may also support additional operations
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Think
about bank accounts – do checking and savings accounts
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differ
in any way? Are they separate classes or instances of the
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same
class? Is there anything common between them?
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