Atomic Classes in Java

From Java 5 onwards Java has added multiple thread safe atomic classes in 'java.util.concurrent' package which can be categories in followings:
1. Atomic class for atomic access to primitive types

• AtomicBoolean
• AtomicInteger
• AtomicLong
• AtomicReference

2. Atomic access to different arrays:

• AtomicIntegerArray
• AtomicLongArray
• AtomicReferenceArray

3. Atomic Field Updaters:  These classes are used to wrap up atomic access, via reflection, to volatile fields of another class.

• AtomicIntegerFieldUpdater
• AtomicLongFieldUpdater 
• AtomicReferenceFieldUpdater 

4.  Atomically integrate a boolean or integer with a reference field:

• AtomicMarkableReference 
• AtomicStampedReference