Ikk：新頁面:
Which two statements are true? (Choose two.)
A. It is possible to synchronize static methods.
B. When a thread has yielded as a result of yield(), it releas...

2013-03-27T16:37:08Z

新頁面: Which two statements are true? (Choose two.) A. It is possible to synchronize static methods. B. When a thread has yielded as a result of yield(), it releas...

新頁面

Which two statements are true? (Choose two.)
   A. It is possible to synchronize static methods.
   B. When a thread has yielded as a result of yield(), it releases its locks.
   C. When a thread is sleeping as a result of sleep(), it releases its locks.
   D. The Object.wait() method can be invoked only from a synchronized context.
   E. The Thread.sleep() method can be invoked only from a synchronized context.
   F. When the thread scheduler receives a notify() request, and notifies a thread, that thread immediately releases its lock.
 

 

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解答

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Ans: A D 

 解說:
 A. It is possible to synchronize static methods. 對靜態的方法同步是可能的。
           B. When a thread has yielded as a result of yield(), it releases its locks.                    當一個執行緒執行yield方法時，會釋放他的locks。                    (執行yield不需要取得與釋放locks)
          C. When a thread is sleeping as a result of sleep(), it releases its locks.                    當一個執行緒執行sleep()，會釋放其locks…                    (執行sleep不需要取得與釋放locks)
           D. The Object.wait() method can be invoked only from a synchronized context.                      一個物件的wait方法只能由同步的本文中被叫用。
            E. The Thread.sleep() method can be invoked only from a synchronized context.
                      Thread.sleep()方法只能由同步的本文中被叫用。
                      (不必)
            F. When the thread scheduler receives a notify() request, and notifies a thread, that thread immediately releases its lock.
                       當執行緒的排班器收到一個notify的通知，被通知的執行緒會立刻釋放其lock                       (排班器是負責從runnable狀態中的執行緒找一個進入cpu，不會去處理在wait狀態中的執行緒)
 

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 226 - 修訂歷史

Ikk：新頁面: Which two statements are true? (Choose two.) A. It is possible to synchronize static methods. B. When a thread has yielded as a result of yield(), it releas...

Ikk：新頁面:
Which two statements are true? (Choose two.)
A. It is possible to synchronize static methods.
B. When a thread has yielded as a result of yield(), it releas...