Java interview guide covers JVM

Short summary

Comprehensive Java interview study guide covering JVM fundamentals, memory management (stack vs heap), string immutability, and 50+ categorized interview questions. Includes cheat sheets for JDK/JRE/JVM layering, type casting, dynamic dispatch, and common conceptual traps.

• •JDK (develop) → JRE (run) → JVM (execute) layering; stack stores methods, heap stores objects
• •Java is always pass-by-value; strings are immutable and pool-optimized at compile time
• •Dynamic dispatch, type casting (upcasting safe, downcasting risky), and 20+ interview trap/solution pairs

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