How should I validate an e-mail address?
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大哥的爱人
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: What\'sagoodtechniqueforvalidatingane-mailaddress(e.g.fromauserinputfield)inAndroid?org.apache.commons.validator.routines.EmailValidatordoesn\'ts...
What's the difference between ConcurrentHashMa
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大哥的爱人
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: IhaveaMapwhichistobemodifiedbyseveralthreadsconcurrently. ThereseemtobethreedifferentsynchronizedMapimplementationsintheJavaAPI: Hashtable Col...
How to read a file from jar in Java?
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大哥的爱人
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: IwanttoreadanXMLfilethatislocatedinsideoneofthejarsincludedinmyclasspath.HowcanIreadanyfilewhichisincludedinthejar? 回答1: Ifyouwanttoreadthatfile...
Sorting a collection of objects [duplicate]
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大哥的爱人
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: Thisquestionalreadyhasananswerhere: SortinganArrayListofobjectsusingacustomsortingorder 10answers IfIhaveasimplelistofStrings:...
Select / assign to data.table when variable names
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大哥的爱人
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: Howdoyourefertovariablesinadata.tableifthevariablenamesarestoredinacharactervector?Forinstance,thisworksforadata.frame: df<-data.frame(col1=1...