Stack only contains references and primitive values, and Heap contains Objects. Use the heap if the variable is large or needs to. In Java, Heap is a region of memory utilized for dynamic memory allocation, such as objects and data structures assigned using the execution of a program. Instructor The Stack and the Heap memory are very different. Access to stack memory is in Last-In-First-Out (LIFO) order. Forgive me for adding an answer to such an old question - The current answer is great, but misses a couple of edge cases because of static code and Java 8 updates. Use the stack when your variable is small and is not going to be used after a method has finished executing. Stack Memory is the Static Memory Allocation Scheme where all the function calls, primitive data values specific to a method and references to the objects in the heap memory are stored. The major difference between Stack memory and heap memory is that the stack is used to store the order of method execution and local variables while the heap.
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