Java FAQ: Top Questions

Atomic classes in java.util.concurrent.atomic , provide thread-safe operations on single variables without locks, using hardware-level atomic instructions like compare-and-swap (CAS).

Key points:

• Classes: AtomicInteger , AtomicLong , AtomicReference , AtomicBoolean , etc.
• Operations: get , set , compareAndSet , getAndIncrement .
• Advantages: Lock-free, high performance for simple updates.
• Use Case: Counters, flags, or shared references in concurrent applications.
• Limitations: Not suitable for complex, multi-step operations.