单选题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.
单选题
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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