231. Given: 

11. Runnable r = new Runnable(){ 

12. public void run(){ 

13. System.out.print("Cat")； 

14. } 

15. }； 

16. Thread t = new Thread(r){

 17. public void run(){ 

18. System.outprint("Dog")； 

19. }

 20. }； 

21. t.start()；

 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.

複選題226. 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.

227. Given: 1. public class TestOne implements Runnable{ 2. public static void main (String[] args)throws Exception{ 3. Thread t = new Thread(new TestOne())； 4. t.start()； 5. System.out.pririt("Started")； 6. t.join()； 7. System.out.print("Complete")； 8. } 9. public void run(){ 10. for(int i=0； i＜4； i++){ 11. System.out.print(i)； 12. } 13. } 14. } 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".

複選題229. Given: 1. public class TestFive{ 2. private int x； 3. public void foo(){ 4. int current = x； 5. x = current + 1； 6. } 7. public void go(){ 8. for(int i=0； i＜5； i++){ 9. new Thread(){ 10. public void run(){ 11. foo()； 12. System.out.print(x + ", ")； 13. }}.start()； 14. }} 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. Given: 1. public class Threads5{ 2. public static void main(String[] args){ 3. new Thread(new Runnable(){ 4. public void run(){ 5. System.out.print("bar")； 6. }}).start()； 7. } 8. } 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. Given: 1. public class Threads1{  2. int x = 0； 3. public class Runner implements Runnable{ 4. public void run(){ S. int current = 0； 6. for(int i=0； i＜4； i++){ 7. current = x； 8. System.out.print(current + ", ")； 9. x = current + 2； 10. } 11. } 12. } 13. 14. public static void main(String[] args){ 15. new Threads1().go()； 16. } 17. 18. public void go(){ 19. Runnable rl = new Runner()； 20. new Thread(r1).start()； 21. new Thread(r1).start()； 22. }23. } 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. Given: foo and bar are public references available to many other threads, foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait(). 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()； F. Object.notify()；

複選題235. Given: 11. public class PingPong implements Runnable{ 12. synchronized void hit(long n){ 13. for(int i=1； i＜3； i++) 14. System.out.print(n + "-" + i + " ")； 15. } 16. public static void main(String[] args){ 17. new Thread(new PingPong()).start()； 18. new Thread(new PingPong()).start()； 19. } 20. public void run(){ 21. hit(Thread.currentThread().getId)； 22. } 23. } 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

239. Given: 1. public class TestOne{ 2. public static void main(String[] args) throws Exception{ 3. Thread.sleep(3000)；  4. System.out.println("sleep")； 5. } 6. } 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.

241. Given: 1. public class Threads3 implements Runnable{ 2. public void run(){ 3. System.out.print("running")； 4. } 5. public static void main(String[] args){ 6. Thread t = new Thread(new Threads3())； 7. t.run()； 8. t.run()； 9. t.start()； 10. } 11. } 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".