方案：
Java 1.6
类动画{
私有字符串名称；
.
公共字符串获取名称() { return name； }
.
}
class CatDog extends Animal { (
私有字符串文档；
私有字符串名称；
.
publicstringgetdogname ((returndogname； }
publicstringgetcatname ((return catname； }
public String[] getNames (() returnnewstring ) ) catname，dogName } )； }
.
公共字符串获取名称((return ' error！ DO NOT USE ME '； }
}
Problem:
getname doesn ' tmakesenseandshouldn ' tbeusedinthisexample.I ' mreadingabout @ deprecated annotation.isthereamoreapppropriatiation
Questions:
a ) isitpossibletoforceanerrorwhenthisfunctionisused (before runtime )？
b ) isthereawaytodisplayacustomizedwarning/errormessagefortheannotationmethodiwilluse？ ideallywhentheuserishoveringoverdeprecated/error function。
解决方案
Generally，you use @ deprecatedformethodsthavebeenmadeobsoletebyanewerversionofyoursoftware， utwhichyou ' rekeepingaroundforapicompatibilitywithcodethatdependsontheoldversion.I ' mnotsureifit ' sexactlythebestagtousiousion becausegetnameisstillbeingactivelyusedbyothersubclassesofanimal，butitwillcertainlyalertusersofthecatdogclassthal
ifyouwanttocauseanerroratcompiletimewhenthatfunctionisused、 youcanchangeyourcompileroptionstoconsideruseof @ deprecatedmethodstobeanerrorinsteadofawarning.of course， you can ' tguaranteethateveryonewhousesyourlibrarywillsetthisoption， and there ' snowayiknowoftoforceacompileerrorjustbasedonthelanguagespecification.removingthemethodfromcatdogwillstillallllllllowcliowcatication sincetheclientwilljustbeinvokingthedefaultimplementationfromthesuperclassanimal (whichpresumablyoustilwanttoinnimal ) ) )
It is certainly possible，however， todisplayacustommessagewhentheuserhoverthedeprecatedmethod.the javadoc @ deprecatedtagallowsyoutospecifyanexplanationationonofwon anditwillpopupinsteadoftheusualdescriptionofthemethodwhentheuserhoversoverthemethodinanidelikeeclipse .eclipse
//*
@Deprecated
公共字符串获取名称
thrownewunsupportedoperationexception (；
}
(notethatyoucanmakeyourimplementationofthemethodthrowanexceptiontoguaranteethatiftheuserdidn ' tnoticethe @ deprecatedtedtagatcon