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

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.

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()；

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".

複選題242. Given: public class NamedCounter{ private final String name； private int count； public NamedCounter(String name){this.name = name；} public String getName(){return name；} public void increment(){count++；} public int getCount(){return count；} public void reset(){count = 0；} 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. Given that Triangle implements Runnable, and: 31. void go() throws Exception{ 32. Thread t = new Thread(new Triangle())； 33. t.start()； 34. for(int x=1； x＜100000； x++){ 35. //insert code here 36. if(x%100 == 0) System.out.print("g")； 37. }} 38. public void run(){ 39. try{ 40. for(int x=1； x＜100000； x++){ 41. //insert the same code here 42. if(x%100 == 0) System.out.print("t")； 43. } 44. }catch(Exception e){} 45. } 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. Given: 1. public class TestSeven extends Thread{ 2. private static int x； 3. public synchronized void doThings(){ 4. int current = x； 5. current++； 6. x = current； 7. } 8. public void run(){ 9. doThings()； 10. } 11. } 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.

1 下列有關萬向接頭（Universal joint）之敘述，何者錯誤？ (A)連接之兩軸的中心線交於一點 (B)連接之兩軸角速度可隨意變更傳動 (C)當主動軸作等角速度運動時，則從動軸可作不等角速度運動 (D)連接兩軸的夾角越大，則兩軸角速度比的變化越小