java – synchronization and volatile variable

I’ve read from this article that: …Synchronized blocks also guarantee that all variables accessed inside the synchronized block will be read in from main memory, and when the thread exits the …

Is it possible to implement a semaphore that avails permits in timed intervals?

I’m trying to implement a program that allows a maximum of 5 customers to enter a store at once. They move around (one block at a time, max 1 customer per block) and then exit. The problem I’m facing …

Thread Safe Singletons in Java

The wikipedia article on Singletons mentions a few thread safe ways to implement the structure in Java. For my questions, let’s consider Singletons that have lengthy initialization procedures and are …