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public class SyncTest （   private int x；   private int y；   private synchronized void setX （int i） （x=1；）   private synchronized void setY （int i） （y=1；）   public 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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出自：专业技术人员继续教育

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