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Callers can use the {{clone()}} method to obtain an instance of such a mutable class. The {{clone()}} method must create a new instance of the {{final}} member class and copy the original state to it. The new instance is necessary because there might not be an accessible copy method available in the member class. If the member class evolves in the future, it is critical to include the new state in the manual copy. Finally, the {{clone()}} method must create and return a new instance of the enclosing class ({{MutableClass}}) using the newly created member instance ({{d}}) \[[SCG 20072009|AA. Bibliography#SCG 0709]\]. |
Mutable classes that define a clone() method must be declared final.
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="4fd1aa007a555d1d-2123c1ab-436a40eb-bb4fbf18-119cb3376bec820a60a52dd1"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API 06]] | [method clone() | http://java.sun.com/javase/6/docs/api/java/lang/Object.html#clone()] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="19c4dfa4b72530de-9216f35d-45d8468d-99d79ce0-587e36bb0127b7ba36f8e1c0"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 39: Make defensive copies when needed and Item 11: Override clone judiciously | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="eb1026637cc0f876-3d0c8ceb-45dd434b-a57f87ea-bb267775350ee5161912b61b"><ac:plain-text-body><![CDATA[ | [[SCG 20072009 | AA. Bibliography#SCG 0709]] | Guideline 2-2 3 Support copy functionality for a mutable class | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2a5f42d6ea10e31e-8232a477-4c6a4931-bf5db495-df7dd18017c029875a9e1493"><ac:plain-text-body><![CDATA[ | [[SCG 2009 | AA. Bibliography#SCG 09]] | Guideline 2-3 Support copy functionality for a mutable class | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="904cd55a87aa1c40-95f50686-4d6e45e2-b0c49b32-68d63a11caba08c1930e1880"><ac:plain-text-body><![CDATA[ | [[Security 2006 | AA. Bibliography#Security 06]] | ]]></ac:plain-text-body></ac:structured-macro> |
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