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Explain Java memory model.

Junior Java
Quick Answer Java Memory Model (JMM) defines how threads interact via shared memory. Key guarantees: volatile fields are always read from main memory (not thread-local cache). synchronized ensures visibility and atomicity - changes made inside synchronized block are visible to all threads after they acquire the same lock. JMM prevents data races when you use proper synchronization.

Answer

Memory divided into Heap (objects) and Stack (references & primitives).
Method area holds class data.
GC manages heap memory.
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