Java tutorial
//package com.java2s; public class Main { public static String toDBC(String string) { if (isEmpty(string)) { return string; } char[] chars = string.toCharArray(); for (int i = 0, len = chars.length; i < len; i++) { if (chars[i] == 12288) { chars[i] = ' '; } else if (65281 <= chars[i] && chars[i] <= 65374) { chars[i] = (char) (chars[i] - 65248); } else { chars[i] = chars[i]; } } return new String(chars); } public static boolean isEmpty(CharSequence string) { return string == null || string.length() == 0; } public static int length(CharSequence string) { return string == null ? 0 : string.length(); } }