Shulou(Shulou.com)06/02 Report--

This article is about how to allocate heap memory and stack memory in Java analysis. The editor thinks it is very practical, so I share it with you. I hope you can get something after reading this article. Let's take a look at it.

Java divides memory into two types: stack memory and heap memory. Some basic types of variables and object reference variables defined in the function are allocated in the stack memory of the function. When a variable is defined in a block of code, Java allocates memory space for the variable in the stack. When the scope of the variable is exceeded, Java will automatically release the memory space allocated for the variable, which can be used for other purposes immediately.

Heap memory is used to store objects and arrays created by new, and the memory allocated in the heap is managed by the automatic garbage collector of the Java virtual machine. After generating an array or object in the heap, you can also define a special variable in the stack so that the value of the variable in the stack is equal to the first address of the array or object in the heap memory. This variable in the stack becomes a reference variable of the array or object. Later, you can use the reference variable in the stack to access the array or object in the heap. A reference variable is equivalent to a name for an array or object. Reference variables are ordinary variables that are assigned on the stack when defined, and are released after the program runs outside its scope. The array and the object itself are allocated in the heap, even if the program runs outside the block of code where the statement that uses new to generate the array or object is located, the memory occupied by the array and object itself will not be released, the array and object will become garbage when there is no reference variable pointing to it, can not be used, but still occupy the memory space, and will be collected (released) by the garbage collector at an uncertain time thereafter.

This is also the reason why Java takes up more memory. In fact, variables in the stack point to variables in heap memory, which is the pointer in Java!

The above is how to allocate heap memory and stack memory in Java analysis. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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