How do you test a String for all alpha characters

How do you test a String for all alpha characters, or all numeric characters returning a bool?
rayskeltonAsked:
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CEHJCommented:
 public static String allAlpha(String s) {
      StringBuffer sb = new StringBuffer(s);
      for(int i = 0;i < sb.length();i++) {
        if(Character.isAlphaChar(sb.charAt(i)) == false)
            return false;
      }
      return true;
  }

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CEHJCommented:
isAlphaChar

should be

isLetter
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rayskeltonAuthor Commented:
Perfect, I changed the return to boolean.

Thanks
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CEHJCommented:
>>I changed the return to boolean.

D'oh, another error ;-)
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