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public class X impleme


public class X implements Runnable(    private int x;   private int y;   public static void main(Stringargs)  X that = new X();   (new Thread(that)).start();  (new Thread(that)).start();  )  public void run() (  for (;;) (  x++;   y++;   System.out.printIn(“x=” + x + “, y = ” + y);   )   )   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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分类:SCJP程序员认证考试题库