Write code to Remove extra (more than one) whitespace characters from any place of the string.
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com "; System.out.println(removeExtraSpaces(str)); }/*from ww w . j a va 2 s . co m*/ /** * Removes extra (more than one) whitespace characters from any place of the string.<br> * Examples:<br> * " aaa bbb ccc ddd " becomes "aaa bbb ccc ddd" * */ public static String removeExtraSpaces(String str) { StringBuilder sb = new StringBuilder(); int pos = 0; boolean prevWS = true; for (int i = 0; i < str.length(); i++) { if (Character.isWhitespace(str.charAt(i)) || i == str.length() - 1) { if (!prevWS) { sb.append(str.substring(pos, i)).append(str.charAt(i)); } prevWS = true; } else { if (prevWS) pos = i; prevWS = false; } } if (Character.isWhitespace(sb.charAt(sb.length() - 1))) sb.deleteCharAt(sb.length() - 1); return sb.toString(); } }