Web Reference: Jan 8, 2024 · The most commonly used atomic variable classes in Java are AtomicInteger, AtomicLong, AtomicBoolean, and AtomicReference. These classes represent an int, long, boolean, and object reference respectively which can be atomically updated. Nov 17, 2025 · Atomic is a type of variable that performs read, write and update in a single uninterruptible step, ensuring thread-safe operations and preventing race conditions. It ensures data consistency without using synchronization or locks. It improves performance through non-blocking, lock-free operations. The java.util.concurrent.atomic package defines classes that support atomic operations on single variables. All classes have get and set methods that work like reads and writes on volatile variables. That is, a set has a happens-before relationship with any subsequent get on the same variable.
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