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  下面是我在Java規范（http://java.sun.com/docs)上看到的幾句話(huà)：

  The method wait should be called for an object only when the current thread  has already locked the object's lock.

  The notify method should be called for an object only when the current thread has already locked the object's lock.

  The notifyAll method should be called for an object only when the current thread has already locked the object's lock.

  即只有當當前線(xiàn)程已經(jīng)獲得了鎖對象，才能調用函數wait、notify和notifyAll，驗證了前面的說(shuō)法。