Call the program with exactly one argument result

Question

Keep getting error of "Call the program with exactly one argument!", but am unsure where I need to make changes to run the program correctly. Thanks!!

class Main {

    private static ArrayList<ArrayList<int[]>> list;

    public static void main(String[] args) throws IOException {
        if (args.length != 3) {
            System.out.println("Call the program with exactly one argument!");
            System.out.println("argument 1: path to map file");
            System.out.println("argument 2: path to airports file");
            System.out.println("argument 3: path to flights file");
            System.exit(-1);
        }

Answer 1

You have to call your main method with three parameters as you point in your code (args.length). In order to call your method via command line:

- java Main.java param1 param2 param3

If you want to call main method using only one parameter, then you'll get println messages you write.