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The {{java.util.Calendar}} class provides a {{compareTo()}} method and an {{after()}} method. The {{after()}} method is documented in the _Java API Reference_ \[[API 2006|AA. Bibliography#APIReferences#API 06]\] as follows: |
The
after()method returns whether thisCalendarrepresents a time after the time represented by the specifiedObject. This method is equivalent to
compareTo(when) > 0
if and only ifwhenis aCalendarinstance. Otherwise, the method returnsfalse.
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This compliant solution uses a design pattern called composition and forwarding (sometimes also called delegation) \[[Lieberman 1986|AA. Bibliography#LiebermanReferences#Lieberman 86]\], \[[Gamma 1995|AA. Bibliography#GammaReferences#Gamma 95], p. 20\]. The compliant solution introduces a new _forwarder_ class that contains a private member field of the {{Calendar}} type; this is _composition_ rather than inheritance. In this example, the field refers to {{CalendarImplementation}}, a concrete instantiable implementation of the {{abstract}} {{Calendar}} class. The compliant solution also introduces a wrapper class called {{CompositeCalendar}} that provides the same overridden methods found in the {{CalendarSubclass}} from the preceding noncompliant code example. |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="0813c723e8ddf0fa-14ef52d8-42f04824-8676aaae-8514f8bb6df4caf6005d1894"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch References#Bloch 08]] | Item 16. Favor composition over inheritance | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="16545260807431d5-682029a7-44c346e0-a8bebd20-63be1497d7d5f2daa0c53fbc"><ac:plain-text-body><![CDATA[ | [[Gamma 1995 | AA. Bibliography#Gamma References#Gamma 95]] | Design Patterns, Elements of Reusable Object-Oriented Software | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="50276b19c12644b2-0dc561bd-485f4e7e-a512b6d0-9cb7005d56de591574263f53"><ac:plain-text-body><![CDATA[ | [[Lieberman 1986 | AA. Bibliography#Lieberman References#Lieberman 86]] | Using prototypical objects to implement shared behavior in object-oriented systems | ]]></ac:plain-text-body></ac:structured-macro> |
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