StartJava aimed primarily at those who are just starting to program in an android. I would say to those who don't even know where to start.
With this program you will not need anything to understand in order to write your first program. StartJava tells you what to do. All you need - just install the program.
The program is arranged quite simple. You choose the lesson and then StartJava starts step-by-step demostration of the creation new program. In this case, you can run what is already written at any time.