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什么是泛型的类型参数？为什么说Java的泛型机制可以保证程序运行时的安全？

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Traditionally,ifatalldarkpersonarrivesatahousejustaftermidnightwithapieceofcoal,thiswillbringgoodlucktothehouse.Somanypeoplevisittheirfriendswithpiecesofcoal.Theyalsobringgiftsofwhiskeyandblackbuns.

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