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單項(xiàng)選擇題

public class SyncTest { 
private int x;  
private int y;  
public synchronized void setX (int i) (x=1;)  
public synchronized void setY (int i) (y=1;)  
public synchronized void setXY(int 1)(set X(i); setY(i);)  
public synchronized Boolean check() (return x !=y;)  
}  
Under which conditions will check () return true when called from a different class? 

A. Check() can never return true.
B. Check() can return true when setXY is called by multiple threads.
C. Check() can return true when multiple threads call setX and setY separately.
D. Check() can only return true if SyncTest is changed to allow x and y to be set separately.

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單項(xiàng)選擇題

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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