How JVM works?

Following are the key components and their responsibility in JVM.

• Classloader − Loads the class file into the JVM.

• Class Area − Storage areas for a class elements structure like fields, method data, code of method etc.

• Heap − Runtime storage allocation for objects.

• Stack − Storage for local variables and partial results. A stack contains frames and allocates one for each thread. Once a thread gets completed, this frame also gets destroyed. It also plays roles in method invocation and returns.

• PC Registers − Program Counter Registers contains the address of an instruction that JVM is currently executing.

• Execution Engine − It has a virtual processor, interpreter to interpret bytecode instructions one by one and a JIT, just in time compiler.

• Native method stack − It contains all the native methods used by the application.