| Reuse Techniques |
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| Implementation inheritance: |
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| Reuse of code by subclassing an existing
class and |
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| modifying
its behavior. |
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| Specification inheritance: |
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| Subclasses are subtypes of their
superclass. Objects of |
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| the
subclass can be substituted for any object of the |
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| superclass
type. |
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| Delegation: |
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| Implementation of an operation by
sending a message to |
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| another
class. |
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| * |