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Java Memory Area


Method Area

  • A space created when the JVM starts
  • A space where Class information, global variable information, and Static variable information are stored
  • Runtime Constant Pool
    • A space where constants are stored, as the name suggests
  • Information is shared across all threads

Heap

  • A space where objects created with the new operator and dynamically created objects such as Arrays are stored
  • Data stored in the Heap area is not destroyed unless processed by GC
  • A space where Reference Type data is stored
  • Information is shared across all threads

Stack

  • A space where temporarily used data such as local variables and method parameters are stored
  • Has a LIFO (Last In First Out) structure, where data that entered last exits first
  • If a local variable is a Reference Type, the address value of data stored in the Heap is stored in the Stack for use
  • A space where Primitive Type data is stored
  • One exists per Thread

PC Register

  • A space created when a Thread is created
  • Registers the address of which instruction the Thread is processing
  • Serves the role of storing the current position being executed by the JVM

Native Method Stack

  • A space used when execution of methods written in languages other than Java (C, C++) is needed