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Threads, Synchronizing code.

Harold Ndou
Ranch Hand

Joined: May 19, 2013
Posts: 34


And given these two fragments:
I. synchronized void move(long id) {
II. void move(long id) {
The answer is C and E:

C. With fragments I, the output could be 4 2 4 2
E. With fragment II, the output could be 2 4 2 4


Hi everyone
I am having tough time in understanding the above output. I want to know how do we get these id's : 4 2 4 2 and 2 4 2 4

I got this code from K & B SCJP 6 Studyguide, chapter 9, self test questions, question 17

I wil real appreciate your assistance.







Chintu Singh
Greenhorn

Joined: May 08, 2013
Posts: 20
Two threads are running on different instances. So you cannot predict the output. The answers you have given will not be always true.


OCPJP
Harold Ndou
Ranch Hand

Joined: May 19, 2013
Posts: 34
My question is how do we get this numbers, How do i know the ID of the current tread .ie 2 4 2 4
milan chovatiya
Greenhorn

Joined: Jul 17, 2013
Posts: 24

i think its random id ..which you are getting
you have to concentrate on synchronized word rather than id values....and one thread will not have same id in 1st n 2nd call...


pain is temporary pride is forever
Harold Ndou
Ranch Hand

Joined: May 19, 2013
Posts: 34
Thanks milan

Now i got the picture
 
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subject: Threads, Synchronizing code.