What are Java semaphores and how do they work?

What are Java semaphores and how do they work?

Java semaphores are synchronization aids that control access to a shared resource by multiple threads. They maintain a set of permits, and threads can acquire or release these permits to manage access.

Can you explain the difference between binary and counting semaphores?

Sure! A binary semaphore can only take two values (0 and 1), acting like a lock. A counting semaphore, on the other hand, can take a range of values, allowing multiple threads to access a resource simultaneously.

How do I implement a semaphore in my Java application?

You can implement a semaphore in Java using the java.util.concurrent.Semaphore class. You create an instance of Semaphore, specifying the number of permits, and then use acquire() and release() methods to manage access.

What are some common use cases for semaphores?

Common use cases include controlling access to a pool of resources, limiting the number of concurrent threads, and managing tasks in producer-consumer scenarios.