Two Threading access the different Synchronize method in a same object.

[Rahul Kumar Tiwari]

Hi Everyone

The scenario is that, There is a class A which has two synchronize method like aa() and bb(), and many other un-synchronize method. Can it is possible that two different thread like YY, and ZZ can access the method aa() and bb() in the same object of class in same time.

If yes then please explain. because i have read that there is a one lock per object. then how can thread YY access aa() method and thread ZZ access bb() method same time.

Thank

[Abimaran Kugathasan]

Two different Threads can't access a synchronized methods on a single object! But One Thread can access different synchronized methods on a single object!

[Nitesh Kant]

Rahul Kumar Tiwari wrote:The scenario is that, There is a class A which has two synchronize method like aa() and bb(), and many other un-synchronize method. Can it is possible that two different thread like YY, and ZZ can access the method aa() and bb() in the same object of class in same time.

No it is not possible and your reasoning, as to why it is not possible, is correct.

Abimaran wrote: But One Thread can access different synchronized methods on a single object!

Although the OP did not ask this scenario but this is a good information.
The reason is that all locks in java are re-entrant. So, if the current thread holds the lock then it will not contend again for the same lock. To make it more explicit, the concurrent utility libraries names the lock classes as ReentrantLock.

[Abimaran Kugathasan]

Thanks Nitesh Kant for that information, BTW, what does mean by OP?

Nitesh Kant wrote:
Although the OP did not.....

[Paul Clapham]

Abimaran Kugathasan wrote:Thanks Nitesh Kant for that information, BTW, what does mean by OP?

OP = Original Poster

[Abimaran Kugathasan]

Paul Clapham wrote:
OP = Original Poster

OK, Thanks...