Hex Encode Strings in Java

HexEncoder.java

public class HexEncoder {

    public static void main(String[] args) {

        System.out.printf("String:%s HexEncoded: %s\n", "hello world", hexEncode("hello world".getBytes()));

    }

    static private String hexEncode(byte[] input) {
        StringBuilder result = new StringBuilder();
        char[] digits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        for (int idx = 0; idx < input.length; ++idx) {
            byte b = input[idx];
            result.append(digits[(b & 0xf0) >> 4]);
            result.append(digits[b & 0x0f]);
        }
        return result.toString();
    }

}