What are the differences between ReentrantLock and synchronized?

What are the differences between ReentrantLock and synchronized in Java?

ReentrantLock and synchronized are both used for thread synchronization in Java, but they have key differences. ReentrantLock is more flexible and allows for features like tryLock and timed lock, while synchronized is simpler and easier to use.

Can you explain the advantages of using ReentrantLock?

Sure! ReentrantLock provides better control over locking mechanisms, allows for interruptible lock waits, and can be used in a more complex locking strategy compared to synchronized.

Are there any performance differences between the two?

Yes, ReentrantLock can offer better performance in scenarios with high contention, as it allows for more sophisticated locking strategies. However, synchronized can be more efficient in simpler cases due to its lower overhead.

When should I use synchronized instead of ReentrantLock?

You should use synchronized when you need a simple and straightforward locking mechanism without the need for advanced features. It's also easier to read and maintain.

Can you give an example of when to use each?

Certainly! Use synchronized for simple methods that require mutual exclusion. Use ReentrantLock in complex scenarios where you need features like timed locks or the ability to interrupt threads.