Top 10 Java wait, notify, Locking and Synchronization Interview Questions

There has been a lot of articles and books written on how to use wait and notify in Java, how they work, when do you need synchronization, and how to write concurrent code in Java, but, unfortunately, I still see many Java programmer struggles to solve even the classic producer-consumer problem. I know, writing correct concurrent code is challenging and it takes a lot of practice, think through ability and experience to get it right, but at the same time, every Java programmer should be familiar with basics of inter-thread communication, synchronization, locking and understand how all the things work together. They should be able to reason the output of program when the same code is executed by more than one thread, at the same time. They should know that compiler can re-order their code to optimize performance and how they can prevent it.

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