I have trouble with understanding class and main and its roll

Question

what's the point of having a main method. And what do you put inside (String[ ] args)

Answer 1

Main method is always invoked first. Basically it is where every java program starts from. Starting from JDK 6 having main method is obligatory. String [] args means that it accepts command line arguments (can be passed when you start the program(e.g.,from a terminal)) in an array of type String with the name "args". You can check it's content printing it to the console just like you would do with any other array.