public static void main(String[] argv) {

int x = 28; // sample number

System.out.printf("%d dec == %s bin\n", x, dec2m(x, 2));

System.out.printf("%d dec == %s oct\n", x, dec2m(x, 8));

System.out.printf("%d dec == %s hex\n", x, dec2m(x, 16));

}

static String dec2m(int N, int m) {

String str = "";

for (int n = N; n > 0; n /= m) {

int rem = n % m;

str = rem < 10 ? rem + str : (char) ('A' - 10 + rem) + str;

}

return str;

}

}