Uses of Package java.util.concurrent.locks (Java Platform SE 8 )
Date: 2026-04-24

# Uses of Package
java.util.concurrent.locks

- Packages that use java.util.concurrent.locks
  Package | Description
  --- | ---
  java.util.concurrent.locks | Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.

- Classes in java.util.concurrent.locks used by java.util.concurrent.locks
  Class and Description
  AbstractOwnableSynchronizer A synchronizer that may be exclusively owned by a thread.
  AbstractQueuedLongSynchronizer.ConditionObject Condition implementation for a `AbstractQueuedLongSynchronizer` serving as the basis of a `Lock` implementation.
  AbstractQueuedSynchronizer.ConditionObject Condition implementation for a `AbstractQueuedSynchronizer` serving as the basis of a `Lock` implementation.
  Condition `Condition` factors out the `Object` monitor methods (`wait`, `notify` and `notifyAll`) into distinct objects to give the effect of having multiple wait-sets per object, by combining them with the use of arbitrary `Lock` implementations.
  Lock `Lock` implementations provide more extensive locking operations than can be obtained using `synchronized` methods and statements.
  ReadWriteLock A `ReadWriteLock` maintains a pair of associated `locks`, one for read-only operations and one for writing.
  ReentrantReadWriteLock An implementation of `ReadWriteLock` supporting similar semantics to `ReentrantLock`.
  ReentrantReadWriteLock.ReadLock The lock returned by method `ReentrantReadWriteLock.readLock()`.
  ReentrantReadWriteLock.WriteLock The lock returned by method `ReentrantReadWriteLock.writeLock()`.

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2026, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.