試題詳解

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.