Quick Answer
JMM defines rules for visibility and ordering of memory operations across threads. Without JMM rules, CPUs and compilers can reorder operations for optimization. Key rules: volatile read/write creates happens-before. Monitor unlock happens-before subsequent lock on same monitor. Thread start happens-before first action in started thread. These rules ensure correct behavior without locking everything.
Answer
Java Memory Model defines visibility, ordering, and atomicity rules. Heap stores objects; Stack stores references and local variables. Method area stores class metadata. PC register tracks execution. Garbage collector manages heap memory automatically.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
