Stack Memory vs Heap Memory in Java. We all know Java doesn’t require programmers’ intervention to manage the memory. Its Garbage Collector frees up the memory when not used. So, why does a Java programmer need to understand memory management then? Although you don’t have to worry about destroying objects, thanks to Garbage Collector, it cannot destroy some entities to clean space as they don’t allow automatic garbage collection. In this blog, we will cover everything you need to know about Java Memory Allocation and its types.