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How many types of memory areas are allocated by JVM?

Krishnapriya Rajeev 355 29 Apr 2023

How many types of memory areas are allocated by JVM?

java java
Updated 01 May 2023
Krishnapriya Rajeev
Krishnapriya Rajeev

Student

I am a Computer Science Engineering student currently in the sixth semester of my B.Tech. program. My interests lie in the areas of machine learning and deep learning and I am also familiar with programming languages such as C, C++, Java, and Python.

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Aryan Kumar
Aryan Kumar 01 May 2023
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The JVM (Java Virtual Machine) allocates memory in several different areas, each with a different purpose. The main memory areas allocated by the JVM are:

  1. Heap Memory: This is the memory area where objects are allocated at runtime. When you create an object in Java, it is allocated on the heap. The heap is shared across all threads in the JVM, and it is automatically managed by the garbage collector.
  2. Stack Memory: This is the memory area where local variables and method parameters are stored during method invocation. Each thread in the JVM has its own stack, and the stack memory is automatically allocated and deallocated as method invocations are pushed onto and popped off the stack.
  3. Method Area: This is the memory area where class definitions, method definitions, and other runtime constants are stored. The method area is shared across all threads in the JVM, and it is populated when a class is loaded by the JVM.
  4. PC Registers: This is the memory area where the program counter (PC) is stored. The PC is a register that contains the memory address of the next instruction to be executed by the current thread.
  5. Native Method Stacks: This is the memory area where native method code is executed. Native methods are written in languages other than Java (such as C or C++) and are executed outside of the JVM. Each thread in the JVM has its own native method stack.

These memory areas are managed by the JVM and are hidden from the programmer. However, understanding these memory areas and how they are managed by the JVM can help you write more efficient and robust Java code.


 

Krishnapriya Rajeev
Krishnapriya Rajeev 29 Apr 2023
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The Java Virtual Machine (JVM) allocates memory for several different areas, each with a specific purpose. Here are the different types of memory areas that are allocated by the JVM:

  • Heap memory: This is the runtime data area where objects are allocated and shared among all threads of a Java application. The Java garbage collector runs to reclaim memory that is no longer being used by objects in the heap memory.
  • Method Area: This is the memory area where class files are loaded. Structures such as runtime constant pool, field and method data, and method code for a Java application are stored in method area.
  • Stack: This area stores local variables and partial results, and it is used by each thread of execution in the application. Each thread in the JVM has its own Java Stack.
  • Native method stack: This is a memory area used to store native method information.
  • PC Registers: This area contains the address of the instruction that is currently being executed by a thread.
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