Java: waiting on synchronized block, who goes first?

Question

This question is inspired by this other question.

If multiple threads are waiting on a synchronized block, and the lock becomes available, who goes firs

Answer 1

It depends on thread priority and thread scheduling algorithm and also the lock on the synchronized block is not "fair". This means that if there are 2 waiting threads with the same priority and the first thread waited more than the second thread that doesn't necessarily mean that the first thread will be executed first.