How do you removing special characters from a string

hi,
i'm a novice to java, if you couldn't tell. i need to write a program to recognise palindromes (eg. madam etc.) but i can't work out how to strip or clean the input string of white space or punctuation. any help appreciated. by the way, any other ideas on how to go about it?? (i don't expect it to be done, just after guidance)
my thanks in advance

OK Here you are:
protected static String removeJunk(String string)
          int i, len = string.length();
          StringBuffer dest = new StringBuffer(len);
          char c;
          for (i = (len - 1); i >= 0; i--)
               c = string.charAt(i);
               if (Character.isLetterOrDigit(c))
                    dest.append(c);
          return dest.toString();
Klint

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