Birthdays in a java pgm

Birthdays.java

public class Birthdays

{

            public static void main(String[] args)

            {

        int D = Integer.parseInt(args[0]);    

        int T = Integer.parseInt(args[1]);    

        int people = 0;                       

       

        for (int t = 0; t < T; t++)

        {

            boolean[] days = new boolean[D];

            while (true)

            {

                people++;                            

                int d = (int) (D * Math.random());   

                if (days[d]) break;                   

                days[d] = true;                      

            }

        }

        double average = (double) people / T;

        System.out.println("Average = " + average);

    }

}