SCJP Questions And Answers

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- 56 - 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. ) 18. )
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").

Answer: D

QUESTION NO: 107
Given:
1. public class SyncTest {
2. private int x;
3. private int y;
4. public synchronized void setX (int i) (x=1;)
5. public synchronized void setY (int i) (y=1;)
6. public synchronized void setXY(int 1)(set X(i); setY(i);)
7. public synchronized Boolean check() (return x !=y;)
8. )
Under which conditions will check () return true when called from a different class?
A. Check() can never return true.