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AdvancedJVM
Explain the Java Memory Model and garbage collection.
Java memory is divided into Heap (objects) and Stack (method frames, primitives). Heap has: Young Generation (Eden + Survivor spaces) for new objects, Old Generation (Tenured) for long-lived objects. GC algorithms: G1GC (default Java 9+, good for large heaps), ZGC (low latency, Java 15+), Parallel GC (throughput focused). For tuning: monitor GC pause times with -verbose:gc, increase heap with -Xms/-Xmx, and use GCEasy.io for analysis.
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