【单项选择题】
public class SyncTest { <br /> private int x； <br /> private int y； <br /> public synchronized void setX （int i） （x=1；） <br /> public synchronized void setY （int i） （y=1；） <br /> public synchronized void setXY（int 1）（set X（i）； setY（i）；） <br /> public synchronized Boolean check（） （return x !=y；） <br /> } <br /> Under which conditions will check （） return true when called from a different class？<p> public class SyncTest { <br /> private int x； <br /> private int y； <br /> public synchronized void setX （int i） （x=1；） <br /> public synchronized void setY （int i） （y=1；） <br /> public synchronized void s
A、A. Check（） can never return true.
B、B. Check（） can return true when setXY is called by multiple threads.
C、C. Check（） can return true when multiple threads call setX and setY separately.
D、D. Check（） can only return true if SyncTest is changed to allow x and y to be set separately.
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