Java tutorial
//package com.java2s; public class Main { public static String showPrintable(byte[] ra) { String s = new String(); for (int i = 0; i < ra.length; i++) { char c = (char) ra[i]; if (((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z'))) { s = s + c; } else { s = s + '.'; } } return s; } }