I need a method that can tell me if a String has non alphanumeric characters.
For example if the String is “abcdef?” or “abcdefà”, the method must return true.
Using Apache Commons Lang:
Alternativly iterate over String’s characters and check with:
You’ve still one problem left:
Your example string “abcdefà” is alphanumeric, since
à is a letter. But I think you want it to be considered non-alphanumeric, right?!
So you may want to use regular expression instead:
String s = "abcdefà"; Pattern p = Pattern.compile("[^a-zA-Z0-9]"); boolean hasSpecialChar = p.matcher(s).find();