How does java allocate memory?

Specific concept:

The memory of JVM can be divided into 3 areas: heap, stack and method area (method, also called static area).

Allocation situation:

Heap area:

1. All objects stored are objects, and each object contains a corresponding class. Information (the purpose of class is to obtain operation instructions);

2. JVM has only one heap area (heap), which is shared by all threads. Basic types and object references are not stored in the heap, only the object itself and arrays are stored. itself;

Stack area:

1. Each thread contains a stack area, and only the basic data type itself and references to custom objects are saved in the stack;

2. The data in each stack (original types and object references) are private and cannot be accessed by other stacks;

3. The stack is divided into three parts: basic type variable area, execution environment context, and operation instruction area. (Storage operation instructions);

Method area (static area):

1. Shared by all threads, the method area contains all classes (class refers to the original code of the class, to be created For an object of a class, the code of the class must first be loaded into the method area and initialized) and static variables. ;

2. The method area contains elements that are always unique in the entire program, such as class and static variables.

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