第233題

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,
答案：AC
參考：8-5-4 匿名內部類別、13-2 Java執行緒與Thread類別、13-3 Runnable介面