Synchronized and wait+notify... which when?

[Akhilesh Trivedi]

We have synchronized way and we have wait+notify way which one to use and when?

Can I say wait+notify would be more efficient when my number of threads increase?

[Henry Wong]

Akhilesh Trivedi wrote:We have synchronized way and we have wait+notify way which one to use and when?

Can I say wait+notify would be more efficient when my number of threads increase?

It is not exactly "either/or". In fact, the wait() and notify() mechanism depends on synchronization.

Henry

[Tom Storm]

Synchronized only means that one thread can have the intrinsic lock of an object at one time. Wait and notify simple suspend a synchronized method and release the intrinsic lock and then notify tells wait to wake up but only releases the lock when it has finished.
Synchronized when accessing a single variable and wait and notify when many threads as there is also notify all.