What are the different types of locks in Java?

Common types of locks in Java include:

1. The synchronized keyword can be used on methods or code blocks to achieve thread synchronization, ensuring that only one thread accesses shared resources at a time.
2. ReentrantLock is an implementation class of the Lock interface, which offers more flexibility in locking operations and supports both fairness and unfairness, as well as interruptible locks.
3. ReadWriteLock is a lock mechanism that contains both read and write locks, allowing multiple threads to acquire read locks simultaneously but only allowing one thread to acquire a write lock.
4. StampedLock is a new locking mechanism added in JDK8, which outperforms ReadWriteLock and performs better in scenarios with more reads than writes.
5. ReentrantReadWriteLock is a class that implements the ReadWriteLock interface and supports read and write locks.
6. LockSupport is a thread utility class that offers functionalities for blocking and waking up threads, used for implementing locks.

Each type of lock has its own characteristics, and the appropriate lock type can be chosen based on specific circumstances to ensure thread safety.