Java中用到CAS的地方很多，基本上用到sun.misc.Unsafe这个类的地方都应用了CAS。该类在jdk\src\share\classes\sun\misc目录下。

在java.util.concurrent.atomic包中那些Atomic*，如java.util.concurrent.atomic.AtomicInteger，java.util.concurrent.atomic.AtomicLong，java.util.concurrent.atomic.AtomicReference都用到了CAS以及java.util.concurrent.locks.AbstractQueuedSynchronizer，java.util.concurrent.locks.AbstractQueuedLongSynchronizer
及实现java.util.concurrent.CountDownLatch.Sync，java.util.concurrent.FutureTask.Sync，java.util.concurrent.locks.ReentrantLock，java.util.concurrent.locks.ReentrantLock.FairSync，java.util.concurrent.locks.ReentrantLock.NonfairSync，java.util.concurrent.locks.ReentrantReadWriteLock.Sync，java.util.concurrent.locks.ReentrantReadWriteLock.FairSync，java.util.concurrent.locks.ReentrantReadWriteLock.NonfairSync，java.util.concurrent.Semaphore.Sync，java.util.concurrent.Semaphore.FairSync，java.util.concurrent.Semaphore.NonfairSync中也都都用到了CAS。