TA貢獻1835條經驗 獲得超7個贊
由于stackoverflow上已有人提出過這個問題，并且解答也很好，我就直接搬運最高票過來，并稍作翻譯。Encapsulationofbehaviorassociatedwithgettingorsettingtheproperty-thisallowsadditionalfunctionality(likevalidation)tobeaddedmoreeasilylater.對與get&set類屬性有關的類的行為進行封裝可以方便以后增加其他功能（比如驗證）Hidingtheinternalrepresentationofthepropertywhileexposingapropertyusinganalternativerepresentation.用不同于內部的展現方式對外公布屬性Insulatingyourpublicinterfacefromchange-allowingthepublicinterfacetoremainconstantwhiletheimplementationchangeswithoutaffectingexistingconsumers.避免對外接口發生變化——當實現發生變化時，對外接口不變，不會影響到現有的調用方Controllingthelifetimeandmemorymanagement(disposal)semanticsoftheproperty-particularlyimportantinnon-managedmemoryenvironments(likeC++orObjective-C).控制屬性的生命周期和內存管理——在無內存管理的環境中尤其重要（比如C++和Objective-C）Providingadebugginginterceptionpointforwhenapropertychangesatruntime-debuggingwhenandwhereapropertychangedtoaparticularvaluecanbequitedifficultwithoutthisinsomelanguages.當屬性的值在運行時發生變化的時候，提供一個調試入口——在某些語言中調試屬性值的變化是很困難的Improvedinteroperabilitywithlibrariesthataredesignedtooperateagainstpropertygetter/setters-Mocking,Serialization,andWPFcometomind.提高與那些操作屬性的getter/setter的庫的互通性——比如Mocking（單測常用的東西,我平時也直接說Mock，不知道怎么翻譯）,序列化,WPF等等Allowinginheritorstochangethesemanticsofhowthepropertybehavesandisexposedbyoverridingthegetter/settermethods.允許子類繼承并覆寫修改屬性的行為的語義Allowingthegetter/settertobepassedaroundaslambdaexpressionsratherthanvalues.允許getter/setter作為lambda表達式而不是值進行傳遞Gettersandsetterscanallowdifferentaccesslevels-forexamplethegetmaybepublic,butthesetcouldbeprotected.getter/setter可以有不同的可訪問性，比如get可以public而set則是protected
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