The ReentrantReadWriteLock (java.util.concurrency.locks.ReentrantReadWriteLock) policy has changed from J2SE 5 to Java SE 6. CyclicBarrier (java.util.concurrent.CyclicBarrier) and CountDownLatch ...

The java.util.concurrent.atomic subpackage contains low-level utility classes that support lock-free thread-safe programming on single variables. The java.util.concurrent.locks subpackage contains ...

We also reiterated and clarified distributed execution and failure semantics of our APIs, as well as made a lot of improvements on the API level. Last, we introduce a new API, FencedLock, that extends ...

Java provides a set of thread-safe collections in the java.util.concurrent package. These collections are designed for concurrent access and can greatly simplify concurrent programming.