239 

What is the result?
(A) Compilation fails.
(B) An exception is thrown at runtime.
(C) The code executes normally and prints "sleep".
(D) The code executes normally, but nothing is printed.

234 From another thread, what provides the most reliable way to ensure that foo will stop executing wait()? (A) foo.notify(); (B) bar.notify(); (C) foo.notifyAll(); (D) Thread.notify(); (E) bar.notifyAll(); (AB) Object.notify();

複選題235 Which two statements are true? (Choose two.) (A) The output could be 8-1 7-2 8-2 7-1 (B) The output could be 7-1 7-2 8-1 6-1 (C) The output could be 8-1 7-1 7-2 8-2 (D) The output could be 8-1 8-2 7-1 7-2

複選題236 What is the result? (A) The code will deadlock. (B) The code may run with no output. (C) An exception is thrown at runtime. (D) The code may run with output "0 6". (E) The code may run with output "2 0 6 4". (AB) The code may run with output "0 2 4 6".

238 Which two code fragments will execute the method doStuff() in a separate thread? (Choose two.)  1.   2.  3  4.  5.  6.  (A) 13 (B) 24 (C) 35 (D) 46

241 What is the result? (A) Compilation fails. (B) An exception is thrown at runtime. (C) The code executes and prints "running". (D) The code executes and prints "runningrunning". (E) The code executes and prints "runningrunningrunning".

複選題242 Which three changes should be made to adapt this class to be used safely by multiple threads? (Choose three.) (A) declare reset() using the synchronized keyword (B) declare getName() using the synchronized keyword (C) declare getCount() using the synchronized keyword (D) declare the constructor using the synchronized keyword (E) declare increment() using the synchronized keyword

複選題243 Which two statements, inserted independently at both lines 35 and 41, tend to allow both threads to temporarily pause and allow the other thread to execute? (Choose two.) (A) Thread.wait(); (B) Thread.join(); (C) Thread.yield(); (D) Thread.sleep(1); (E) Thread.notify();

244 Which statement is true? (A) Compilation fails. (B) An exception is thrown at runtime. (C) Synchronizing the run() method would make the class thread-safe. (D) The data in variable "x" are protected from concurrent access problems. (E) Declaring the doThings() method as static would make the class thread-safe. (AB) Wrapping the statements within doThings() in a synchronized(new Object()){} block would make the class thread-safe.

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