Generator.java

/* *****************************************************************************
 *  Name:              Ada Lovelace
 *  Coursera User ID:  123456
 *  Last modified:     October 16, 1842
 **************************************************************************** */

public class Generator {
    public static String randomString(int L, String alpha) {
        char[] a = new char[L];
        for (int i = 0; i < L; i++) {
            int r = (int) ((Math.random() * alpha.length()));
            a[i] = alpha.charAt(r);
        }
        return new String(a);
    }

    public static void main(String[] args) {
        int N = Integer.parseInt(args[0]);
        int L = Integer.parseInt(args[1]);
        String alpha = args[2];
        for (int i = 0; i < N; i++)
            StdOut.println(randomString(L, alpha));
    }
}