Memory model

The memory model describes how the JVM interacts with a computer's memory. By computer memory, we mean not only Random Access Memory (RAM) but also registers and cache memory of the CPU. So we consider the memory model as a simplified abstraction of the hardware memory architecture.

We can consider the whole JVM as a model of a computer that provides the ability to run a program on a wide range of processors and operating systems.

An understanding of the Java Memory Model is important because it specifies how different threads interact in memory. Concurrent programming involves plenty of different pitfalls in synchronization between threads that have shared variables and compliance with the consistency of a sequence of operations.