public static boolean isAnagram(String string1, String string2){
    StringBuilder builder1 = new StringBuilder();
    StringBuilder.builder2 = new StringBuilder();
    lstring1 = string1.toLowerCase();
    lstring2 = string2.toLowerCase();
    for (int i = 0; i < string1.length(), i = i + 1){
    if (string1.charAt(i) >= 'a' && string1.charAt(i) <= 'z' || string1.charAt(i) >= '0' && string1.charAt(i) <= '9')
      string1.append(charAt(i));
    }
    for (int j = 0; j < string2.length(), j = j + 1){
    if (string2.charAt(j) >= 'a' && string2.charAt(j) <= 'z' || string2.charAt(j) >= '0' && string2.charAt(j) <= '9')
      string2.append(charAt(j));
    }
    if (string1.length() != string2.length())
      return false;

  }