JQuest Mock Exam Question

[Bin Zhao]

I have a question about the fol from JQuest Mock Exam
Read the following snippet carefully
1. public synchronized void someMethod() {
2. //lots of code
3. try {
4. Thread.sleep(500);
5. } catch(InterruptedException e) {
6. //do some things here.
7. }
8. //more and more code here
9. }
Select all correct answers
a) //ignored
b)The Thread sleeps at least 500ms if not interrupted.
c) when thread go to sleep,it release the lock on the object.
d)The "sleeping" threads always have the lock on the object.
question:
why the answer are c) and d)
I chose b) and c)
I think c) conflicts with d)
Can anyone explain this?
Thx in advance.

[Matt DeLacey]

I agree with you. I strongly believe d is incorrect. Did you copy and paste the answers?
Matt

[Paul Anilprem]

Calling sleep() does not release the lock. So the ans should be b and d.
-Paul.
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[This message has been edited by Paul Anil (edited November 11, 2000).]

[Bin Zhao]

yes, answer c) and d) are absolutely identical to the meaning of the original test.
Can anyone throw more light on the effect of executing Thread.sleep() in a synchronized method on the lock of that thread holds?

[Nijeesh Balan]

Hi Bin,
Even I feel that b and d are right answers...
B'cos I have read somewhere that sleep() doesn't release the lock on an object..
Thanks,
Nijeesh.