Contact

Email

For Jim’s email, invoke this method:

public static String email(String firstname, String lastname) {
    final char AT = '@';
    StringBuilder sb = new StringBuilder();
    sb.append(Character.toLowerCase(firstname.charAt(0)))
      .append('.')
      .append(lastname.toLowerCase())
      .append(AT).append("ku.th");
    return sb.toString();
}
//TODO Modify algorithm to work for Thai names, too.

When you need to join or modify Strings, a StringBuilder (as above) is more efficient than using Strings. Stringbuilder is mutable (the methods modify the StringBuilder object) while Strings are immutable (every operation creates a new String).