231 

What is the result?
(A) Cat
(B) Dog
(C) Compilation fails.
(D) The code runs with no output.
(E) An exception is thrown at runtime.

227 What can be a result? (A) Compilation fails. (B) An exception is thrown at runtime. (C) The code executes and prints "StartedComplete". (D) The code executes and prints "StartedComplete0123". (E) The code executes and prints "Started0123Complete".

228 Which three will compile and run without exception? (Choose three.)  1. private synchronized Object o;  2.  3. public synchronized void go(){/* code here */}  4. private synchronized(this) void go(){/* code here */}  5.  6.  (A) 123 (B) 235 (C) 356 (D) 456

複選題229 Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ? (Choose two.) (A) move the line 12 print statement into the foo() method (B) change line 7 to public synchronized void go(){ (C) change the variable declaration on line 2 to private volatile int x; (D) wrap the code inside the foo() method with a synchronized(this) block (E) wrap the for loop code inside the go() method with a synchronized block synchronized(this){//for loop code here}

230 Given that t1 is a reference to a live thread, which is true? (A) The Thread.sleep() method can take t1 as an argument. (B) The Object.notify() method can take t1 as an argument. (C) The Thread.yield() method can take t1 as an argument. (D) The Thread.setPriority() method can take t1 as an argument. (E) The Object.notify() method arbitrarily chooses which thread to notify.

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

複選題233 Which two are possible results? (Choose two.) (A) 0, 2, 4, 4, 6, 8, 10, 6, (B) 0, 2, 4, 6, 8, 10, 2, 4, (C) 0, 2, 4, 6, 8, 10, 12, 14, (D) 0, 0, 2, 2, 4, 4, 6, 6, 8, 8, 10, 10, 12, 12, 14, 14, (E) 0, 2, 4, 6, 8, 10, 12, 14, 0, 2, 4, 6, 8, 10, 12, 14,

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