What is the difference between heap and stack?

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

The difference between heap and stack:

1. Heap is a heap and stack is a stack.

2. The stack space is automatically allocated and released by the operating system, while the heap space is manually applied for and released. The heap is often allocated with the new keyword.

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

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

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