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Thread question . Please help .

Sim Kim
Ranch Hand

Joined: Aug 06, 2004
Posts: 268
1. public class SyncTest {
2. private int x;
3. private int y;
4. public synchronized void setX (int i) (x=i
5. public synchronized void setY (int i) (y=i
6. public synchronized void setXY()(set X(i); setY(i)
7. public synchronized Boolean check() (return x !=y
8. )

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
Barry Gaunt
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Joined: Aug 03, 2002
Posts: 7729
Does anyone know where these questions are coming from?

Ask a Meaningful Question and HowToAskQuestionsOnJavaRanch
Getting someone to think and try something out is much more useful than just telling them the answer.
Sim Kim
Ranch Hand

Joined: Aug 06, 2004
Posts: 268
Hi Barry,

Got this from some site which was giving mock exams . I don't remember the site exactly . I collected it two months ago .

Any issues in the questions .
I agree. Here's the link:
subject: Thread question . Please help .
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