I'm making a tool that does multiple things, and I'm onto the last feature for now: You type in a date and it tells you what day of the week it would be on that date.

So I have two problems here:

1. I can't use I can't use arguments, it doesn't like them
2. On the last line, I can't use jTextArea2.setText(d0); because it doesn't like that either...

My code is here:

    public static void main(String[] args) { 
        int d = Integer.parseInt(args[0]);
        int m = Integer.parseInt(args[1]);
        int y = Integer.parseInt(args[2]);

        int y0 = y - (14 - m) / 12;
        int x = y0 + y0/4 - y0/100 + y0/400;
        int m0 = m + 12 * ((14 - m) / 12) - 2;
        int d0 = (d + x + (31*m0)/12) % 7;

        System.out.println("Sunday = 0\nMonday = 1\nTuesday = 2\nWednesday = 3\nThursday = 4\nFriday = 5\nSaturday = 6\nThis date is on a:");
        System.out.println(d0);

Basically, this code was at first for use with the console, and now I want to implement it into a Swing GUI app.

I'm only a week into learning Java, so excuse me if the problem is obvious or easy to fix... But can anyone figure out how to work it? Thanks!