JVM stands for Java Virtual Machine, which is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describes what is required in a JVM implementation. The JVM has two primary functions: to allow Java programs to run on any device or operating system (known as the "write once, run anywhere" principle), and to manage and optimize program memory.
The JVM is an abstract machine that provides a runtime environment in which Java bytecode can be executed. It is a specification that is available for many hardware and software platforms, but it is platform-dependent. The JVM performs several operations, including loading, verifying, and executing Java bytecode.
The JVM architecture consists of several components, including the classloader, memory area, execution engine, and Java Native Interface (JNI) . The classloader loads class files into the memory area, and the execution engine executes the bytecode. The memory area is divided into several components, including the method area, heap, stack, and PC registers. The PC registers store the address of the current execution instruction of a thread, and each thread has separate PC registers. The stack area stores per-method operand stack and per-method local variables. The heap area stores objects, and the method area stores class-level data.
In summary, the JVM is a virtual machine that enables a computer to run Java programs and manage program memory. It is an abstract machine that provides a runtime environment in which Java bytecode can be executed. The JVM architecture consists of several components, including the classloader, memory area, execution engine, and JNI.
