Simple Program - Day Number

Question

Hi, I am trying to pick up java...and need help with a program
I want to be able to figure out the number of days into a year from a date --
for example - user input -
year - 2001
month - 01
day 01
the output would be 1...
and for dec. 31, 366 (depending on leap year)
I am trying to do it without cal methods...basically just joptionpane if anything
Thanks so much!
Jason

Answer 1

This is based on some old C logic.
public class DayOfYear
    public static void main(String[] args)
        int year = Integer.parseInt(args[0]);
        int mo = Integer.parseInt(args[1]) - 1;
        int day = Integer.parseInt(args[2]);
        int leap = 0;
        int[][] mos = {
            {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
            {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
        if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
           leap = 1;
        for(int n = 0; n < mo; n++)
            day += mos[leap][n];
        System.out.println("days = " + day);
}