What's the difference between heap and stack?

This article is about the difference between heap and stack. Xiao Bian thinks it is quite practical, so share it for everyone to make a reference. Let's follow the editor and have a look.

The difference between heap and stack: 1, heap is heap, stack is stack;2, stack space is automatically allocated and released by the operating system, heap space is manually applied and released;3, stack space is limited, heap space is a large free area.

Difference between heap and stack:

Heap is a heap and stack is a stack.

2, stack space is automatically allocated and released by the operating system, heap space is manually applied for and released, heap commonly used new keyword to allocate.

3, stack space is limited, heap space is a large free area. In Java, if you just declare an object, you allocate address space in stack memory, and if you instantiate it with new, you allocate addresses in heap memory.

4, example: data type variable name; so defined things in the stack area. For example: Object a =null; only allocate space in stack memory new data type (); or malloc(length); things defined in this way are in heap area For example: Object b =new Object(); allocate space in heap memory

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