Java tutorial
//package com.java2s; public class Main { private static final char CHAR_CHINESE_SPACE = '\u3000'; public static String compact(String s) { char[] cs = new char[s.length()]; int len = 0; for (int n = 0; n < cs.length; n++) { char c = s.charAt(n); if (c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == CHAR_CHINESE_SPACE) continue; cs[len] = c; len++; } return new String(cs, 0, len); } }