String handling - email id generation

// String handling

/*

Write a java program that reads a string from inputs containing first name, last name and computes an e-mail address with first 3 letters of the first name, first 4 letters of last name, '.' separator and domain. Display the outputs by invoking objects.                                            

*/

import java.util.*;

class email

{

     String fn, ln;

     Scanner s = new Scanner(System.in);

    

     public void fnread()

     {

          System.out.print("Enter first name : ");

          fn = s.next();

          System.out.print("Enter last name : ");

          ln = s.next();

     }

    

     public void fnGenerate()

     {

          if(fn.length()<3 || ln.length()<4)

              System.out.print("invalid input. Email id cannot be generated.");

          else

          {

              String emailid = fn.substring(0,3)+"."+ln.substring(0,4)+"@gmail.com";

              System.out.println("Email id : "+emailid);

          }

     }

}

class SH1

{

     public static void main(String as[])

     {

          email eid = new email();

          eid.fnread();

          eid.fnGenerate();

     }

}