Java Memory Management

Stack and Heap

Explanation:
The JVM divides memory into stack and heap areas. The stack stores method calls, local variables, and primitive data. It follows LIFO order and is fast. The heap stores objects, arrays, and reference types and is managed by the garbage collector. Proper understanding of stack vs heap helps developers write efficient, leak-free code.

Code:

int x = 10;          // Stack
Car c = new Car();   // Reference on stack, object in heap

Technical Example:
High-performance trading systems optimize stack usage to minimize garbage collection pauses.

Use Cases:
• JVM performance tuning
• Memory leak analysis
• High-throughput server applications

Garbage Collection

Explanation:
Java’s garbage collector (GC) automatically frees unused objects, preventing memory leaks and crashes. Modern collectors (G1, ZGC, Shenandoah) provide low-latency performance ideal for enterprise and cloud applications. GC operates by identifying unreachable objects through reachability analysis from root references.

Code:

System.gc();  // Suggest GC (not guaranteed)

Technical Example:
Cloud microservices use low-pause collectors to maintain smooth user experience under heavy load.

Use Cases:
• Enterprise Java servers
• Distributed cloud systems
• Memory-intensive applications