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The difference between heap and stack
Heap and stack are two common memory allocation mechanisms in computers. They are very different in the way of memory management, allocation and usage scenarios. This article will introduce in detail the characteristics, differences and respective usage scenarios of heap and stack. PHP Chinese website has brought you relevant tutorials and articles. Welcome everyone to come and learn and read.
What are the differences between heap and stackThe differences between heap and stack are: 1. Difference in space allocation; 2. Difference in caching method; 3. Difference in data structure. The heap space is generally allocated and released by the programmer, and the stack space is automatically allocated and released by the operating system (compiler). The stack uses the first level cache and the heap uses the second level cache.
What are the differences between java heap and stackDifference: Stack memory is used to store local variables and method calls, while heap memory is used to store objects in Java. Stack memory belongs to a single thread. Each thread will have a stack memory, and the variables it stores can only be visible in the thread to which it belongs. Objects in heap memory are visible to all threads, objects in heap memory can be accessed by all threads, and so on.
Introduction to the difference between heap and stackThe difference between the heap and the stack is: 1. The heap is a runtime data area, and class objects allocate space from the heap; 2. The stack mainly stores variables and object references of some basic data types; 3. The access speed of the heap Slower, the advantage of the stack is faster access speed.
The difference between heap and stackThe difference between heap and stack: 1. The memory allocation method is different. The heap is manually allocated and released by the programmer, while the stack is automatically allocated and released by the operating system. 2. The size is different. The size of the stack is fixed, while the stack is automatically allocated and released by the operating system. The size of is growing dynamically; 3. Data access methods are different. In the heap, data access is achieved through pointers, while in the stack, data access is achieved through variable names; 4. Data life cycle , In the heap, the life cycle of data can be very long, while in the stack, the life cycle of variables is determined by the scope in which they are located.
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