if nothing else, you can start with a main program that prints "I'm in main". compile and get that working.
That is how i start EVERY SINGLE
java program.
Then, decide what is the minimum amount of code you can add that moves you closer to the end result. (Hint: the answer is always closer to 1 line than anything else)
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors