Identify letters in various languages

Hi,
I have a huge dictionary project and one of my main problems is to identify letters in other languages than english(Spanish, Danish , German , Greek ...)
I have heard about the UTF 8 standard, is there any known libary with a function that will be able to identify for me if a given character is a letter or not?
if i was only using the english language i would have checked for ascii codes but it is not possible with all of those lanuguages

Even if you cannot help me thanks any way for reading till here (=

Check out the java.lang.Character class. It has a number of methods to identify a character's type some of which work on all language sets including those with complex supplementary character codes.