Exit and halt Java virtual machine

void exit(int status)

Terminates the currently running Java virtual machine by initiating its shutdown sequence.

void halt(int status)

Terminates the currently running Java virtual machine.

public class Main {
  public static void main(String[] args) {
    Runtime runtime = Runtime.getRuntime();

    runtime.exit(2);
  }
}

1. Runtime class
2. Get the instance of a runtime
3. Get the memory in your Java virtual machine
4. Shut down hook
5. Get the available processor
6. Exit and halt Java virtual machine
7. Run garbage collector and finalization methods
8. Execuate a system command