Java FAQ: Top Questions

46. What is the VarHandle in Java?

VarHandle , introduced in Java 9 in java.lang.invoke , provides fine-grained, type-safe access to variables, offering atomic operations and memory ordering control.

Access: Supports get, set, compare-and-swap, and other operations.
Memory Ordering: Options like getVolatile , getAcquire for JMM control.
Creation: Via MethodHandles.lookup().findVarHandle .
Advantages: More performant than AtomicReference for specific use cases.
Use Case: Low-level concurrency, custom synchronization.

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