Write code to check if a string is Alphanumeric or Space
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com"; System.out.println(isAlphanumericSpace(str)); }//ww w. j a va 2s .com public static boolean isAlphanumericSpace(String str) { if (str == null) { return false; } int length = str.length(); for (int i = 0; i < length; i++) { if (!Character.isLetterOrDigit(str.charAt(i)) && (str.charAt(i) != ' ')) { return false; } } return true; } }