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單項(xiàng)選擇題

1. public class X implements Runnable( 
2. private int x; 
3. private int y; 
4.   
5. public static void main(String[]args) 
6. X that = new X(); 
7. (new Thread(that)).start(); 
8. (new Thread(that)).start(); 
9. ) 
10.   
11. public void run()  ( 
12. for (;;)  ( 
13. x++; 14. y++; 
15. System.out.printIn(“x=” + x + “, y = ” + y); 
16.     )
17. )
What is the result?()

A. Errors at lines 7 and 8 cause compilation to fail.
B. The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x=2, y=1”).
C. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”).
D. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears only for once (for example, “x=1, y=1” followed by “x=2, y=2”).

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