Ikk：新頁面: Given:
7. void waitForSignal(){
8. Object obj = new Object();
9. synchronized(Thread.c...

2013-03-27T16:44:33Z

新頁面: Given: 7. void waitForSignal(){ 8. Object obj = new Object(); 9. synchronized(Thread.c...

新頁面

Given:
 7.   void waitForSignal(){
 8.           Object obj = new Object();
 9.            synchronized(Thread.currentThread()){
 10.                   obj.wait();
 11.                   obj.notify();
 12.          }
 13.  }

 Which statement is true?
   A. This code can throw an InterruptedException.
   B. This code can throw an IllegalMonitorStateException.
   C. This code can throw a TimeoutException after ten minutes.
   D. Reversing the order of obj.wait() and obj.notify() might cause this method to complete normally.   E. A call to notify() or notifyAll() from another thread might cause this method to complete normally.   F. This code does NOT compile unless "obj.wait()" is replaced with "((Thread) obj).wait()". 

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解答

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Ans: B 

 解說:
IllegalMonitorStateException是說一個執行緒試圖在未取得物件lock時，去對該物件進行等待(wait)或通知(notify)的動作，

         會產生的一個不合法的監控狀態例外。
          正確的程式寫法應如下：
                    synchronized(obj) {
                      }
          取行obj的lock後，方能對obj進行wait或notify。

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 221 - 修訂歷史

Ikk：新頁面: Given: 7. void waitForSignal(){ 8. Object obj = new Object(); 9. synchronized(Thread.c...

Ikk：新頁面: Given:
7. void waitForSignal(){
8. Object obj = new Object();
9. synchronized(Thread.c...