What are the differences between locks in Java?

What are the differences between locks in Java?

In Java, there are several types of locks, including intrinsic locks (synchronized blocks) and explicit locks (ReentrantLock). Intrinsic locks are tied to the object and are simpler to use, while explicit locks offer more flexibility and features like tryLock and timed lock.

Can you explain how ReentrantLock works?

ReentrantLock is a part of the java.util.concurrent package. It allows a thread to re-enter the lock it already holds, which means it can acquire the lock multiple times without getting blocked. This is useful in scenarios where a method calls another method that requires the same lock.

What are the advantages of using explicit locks over synchronized blocks?

Explicit locks provide more control over the locking mechanism, such as the ability to interrupt a thread waiting for a lock, try to acquire a lock without blocking, and implement fair locking policies. This can lead to better performance and responsiveness in concurrent applications.

Are there any downsides to using ReentrantLock?

Yes, while ReentrantLock offers more features, it also requires more careful management. If a lock is not released properly, it can lead to deadlocks or resource leaks. Additionally, it can be more complex to implement compared to synchronized blocks.