Character frequency

Source code

class Freq {
    static void frequency(String s) {
        int[] count = new int[256];
        for (int i = 0; i < s.length(); i++) {
            count[s.charAt(i)]++;
        }
        for (int c = 0; c < 256; c++) {
            if (count[c] > 0) {
                System.out.println((char) c + ": " + count[c]);
            }
        }
    }
}