I apologize, but there is no such class as "CharTypes" in the Apache Commons IO library. It seems that you might be confusing it with other class or package. Apache Commons IO focuses on providing utility classes for file and I/O operations, and it doesn't have a class specifically for working with character types.

If you are looking for a way to work with character types in Java, you can use the Character class, which provides several methods for determining the type of a character, such as Character.isDigit(char), Character.isLetter(char), Character.isWhitespace(char), etc.

Here is an example of using the Character.isDigit() method to check if a character is a digit:

public class CharTypesExample {
    public static void main(String[] args) {
        char c = '5';
        if (Character.isDigit(c)) {
            System.out.println(c + " is a digit.");
        } else {
            System.out.println(c + " is not a digit.");
        }
    }
}

This will output:

5 is a digit.

You can also use the Character.isLetter() to check if a character is a letter, Character.isWhitespace() to check if a character is a whitespace and many more.