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OOP and user validation?


Joined: May 17, 2002
Posts: 4
i have a problem in java...and i'm not quite sure how to solve it, and was wandering if anyone would be able to help me out here...
i have started something but not sure what to do next.
Here is the problem:
Problem 1
A program accepts identification number, first name, last name, and email address of a user. It validates the data as per following specifications:
.identification number � no blanks, four numerical characters;
.first name � no blanks, all alphabetical characters;
.last name � same as for first name;
.email address�
.no blanks;
.only one �@�character;
,there is at least one word before �@�, and at least two words after �@�, both words(following �@�) joined by �.�, no space between the words before and after the �.� character.
Assume that there are maximum of two words following �@�character, and there are maximum of 25 characters in the email address.
If any of the data item is invalid, program displays an appropriate message to the user and asks for re-entry of that item.
When all data items entered are valid, program creates a password for the user by joining:
.first two characters of first name;
.2nd and 3rd characters of identification
.last three characters from the last name;
in above order.
Password is then relayed back to user. Later then enters this password and program then checks that user has entered the correct password (as created for him/her), and displays the message to the user accordingly.
You do not need to create any special user interface but must utilize string and array processing functions
and here is my source code so far.. if any one helpful enough could fix the program for me that would be much appreciated..thanks
kind regards,
public class UserValidation {
//declare variables
private int id;
private String firstname;
private String lastname;
private String email;
private BufferedReader input = new BufferedReader // Handles console input
(new InputStreamReader(;
public int getId() throws IOException{
System.out.println("Input UserID:");
id = Integer.parseInt(input.readLine());
return id;
public String getfName(){
return firstname;
public String getlName(){
return lastname;
public String getEmail(){
return id;
public void display(){
System.out.println(" " + getId() + getfName() + getlName() + getEmail());
public static void main (String args[]){
UserValidation user = new UserValidation();
Dirk Schreckmann

Joined: Dec 10, 2001
Posts: 7023
Welcome to JavaRanch!
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Thanks Pardner!

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Joined: May 17, 2002
Posts: 4
hi? sorry my real name is Atif Abbas
so can some one help me out with my project please...
Dirk Schreckmann

Joined: Dec 10, 2001
Posts: 7023
Hello Atif,
Two Things:
  • Please change your display name to comply with The JavaRanch Naming Policy.
  • When posting code, please surround the code with the [ code ] and [ /code ] ubb tags.
  • Thank You
    Dirk Schreckmann

    Joined: Dec 10, 2001
    Posts: 7023
    Your code won't compile.
    I'd suggest that you write a very simple program to just get one piece of information. Once you get that working, then try dealing with multiple attributes and the required manipulations.
    Do you know how to get a single input from the user and display this input?
    Are you sure this is an advanced Java topic?
    David Weitzman
    Ranch Hand

    Joined: Jul 27, 2001
    Posts: 1365
    This is the sort of thing regular expressions handle very smoothly, but I'm not sure that's the best solution for you (regex is a language unto itself, plus you need jdk 1.4 to run it).
    Dirk Schreckmann

    Joined: Dec 10, 2001
    Posts: 7023
    It appears you'd rather continue this conversation in the beginners' forum...
    I agree. Here's the link:
    subject: OOP and user validation?
    It's not a secret anymore!