From your text I assume that you are not very familiar with how the CPU executes statements, which is the basic knowledge necessary to write your own programming language.
To get that you should first spend some time with a real assembler language, which you can do online or offline. I strongly recommend to read some tutorials on this as this is anything but trivial. Learning Assembler will give you a much better understanding what the CPU actually does when it has to execute some code.
You don't have to become an Assembler expert, but once you have some understanding of it, it becomes suddenly very clear what to do to get the JVM - essentially a CPU emulator - to execute your code: you need to compile it into a form that the JVM can execute, then simply tell it to do that.
Edit: Seems I guessed wrong. ;)
Java bytecode instruction listings: Wikipedia
Devailed VM spec: Oracle