Remember me.....well i need some real help now....:)

Question

Hello guys,i hope that u remember me...if not i hope that u ll help me anyway....
well,i had an assignment for my university...i posted it and u told to start reading several books and try to write some code....
i came up with the following code:
import java.util.Random;
import java.util.*;
import java.text.DateFormat;
class Account {
     double initbal;
     double deposit;
     double withdraw;
//Account constructor
Account() {
     initbal=0;
     deposit=0;
     withdraw=0;
//method for calculating the balance
double balance() {
     return (initbal+deposit)-withdraw;
class BankAccount {     
     double initbal;
     private double deposit;
     private double withdraw;
     public static void main(String args[]) {
     Account Dimitris=new Account();               //call the constructor
     CurrentAccount Over=new CurrentAccount();
try {     //exception added for fault parameters
     Dimitris.initbal=Double.parseDouble(args[0]);     //string parsing into a double
     Dimitris.deposit=Double.parseDouble(args[1]);     //string parsing into a double
     Dimitris.withdraw=Double.parseDouble(args[2]);     //string parsing into a double
     } catch (ArrayIndexOutOfBoundsException e) {
          System.out.println("You must enter three values!!");
     } catch (NumberFormatException e) {
          System.out.println("Only numbers are allowed!!");
     double AvlOvr;
     double bal;
     bal=Dimitris.balance();          //method called
     System.out.println("Initial balance is: "+Dimitris.initbal);
     System.out.println("Deposit Amount is: "+Dimitris.deposit);
     System.out.println("Withdraw amount is: "+Dimitris.withdraw);
     System.out.println("Overdraft limit is: "+Over.AvlOvr);
if (withdraw>(initbal+deposit)) {
     System.out.println("Insufficient Funds");
else
     System.out.println("Balance is: "+bal);
     System.out.println("Available Funds is: "+(bal+Over.AvlOvr));
     //display the date and time for the current locale     
     Date date=new Date();
     DateFormat dateFormatter=DateFormat.getDateTimeInstance(DateFormat.SHORT,DateFormat.SHORT);
     System.out.println(dateFormatter.format(date));
class CurrentAccount extends BankAccount {
private float accId;
double AvlOvr;
CurrentAccount() {
double ovdr;
ovdr=100;
AvlOvr=ovdr;
interface Personal {
void Deposit ();
void Withdraw ();
the thing is that i need some help cause i cant find some sollutions....
i d like to give to the user a random id....
then at the CurrentAccount subclass i d like to add a Username to the user.Then Level 2 worries me as well.....I ll post u my assignment so u can have a look....If u could help me with Level 2 sollution and the thing that i told u before i d be grateful.......
by the way..i hope that u all guys have nice holidays!!!
Here is the assignment:
JAVA LAB ASSIGNMENT � B241
Bank Account
Level 1
Create a bank account that reads in the following information about a single customer
account:
Initial balance
Deposit amount
Withdraw amount
Current Date
Give the account holder a random account id number.
Display error messages if the number of parameters is incorrect or negative parameters are
entered.
Verify that the amount being withdrawn is available (i.e. make sure that the initial balance +
deposit amount is greater than or equal to the amount being withdrawn).
Calculate the balance amount in the account after the transaction has been completed.
Tasks:
- Create a BankAccount class, which defines a bank account
- Use command line arguments to read in the account information
- The customer account values are private and accessible only through the
BankAccount class
- Use the file, InsufficientFundsException.java given to you (Location:
/global_ro/rekha/B241/assignment) to create an Exception class called
InsufficientFundsException.class that throws an exception if an
InsufficientFundsException occurs in your BankAccount class. Make the necessary
changes to the file if you feel the need to do so.
- Print out the following information:
2
account holder�s id
balance amount
amount being withdrawn
the current date and time
(Hint: this will occur when the amount withdrawn is more than the total amount in the
account. Your withdraw method throws the InsufficientFundsException exception which
should be caught in your main program from where you are calling the withdraw method).
Subclass the BankAccount class for the specifics of a CurrentAccount class that adds an
additional field to the already existing information:
User name
The account balance and account id values should still be private and now accessible only
through the CurrentAccount subclass.
Allow the CurrentAccount class to provide overdraft protection of up to �100.
Task:
- Incorporate the additional functionalities into your initial program and print out the
values as before.
********************************END OF LEVEL 1 **************************
Level 2
Add the following functionalities to your Level 1 program.
Define an interface named Personal, consisting of two methods:
Deposit
Withdraw
Read in the account information specified in Level 1 for more than one user through the
command line parameters and display appropriate error messages as before.
Calculate the balance amount in each account after the transaction has been completed.
Tasks:
- Increment the account id each time a customer is added (For instance, if the first
customer id is 100, the next id should be 101 and so on).
- Implement the Personal interface in the BankAccount class.
- Print out the customer information for all customers as you did in Level 1.
*****************************END OF LEVEL 2*****************************
Level 3
Extend the above features to add some more personal information about the customer such
as:
a. Name: surname first name
b. Date of birth: day/month/year
c. Address: street
Town
Postcode
d. Phone: home number work number
e. E-mail: e-mail address
Customer�s data is stored in a file. It is retrieved from the file when the bank is opened and
stored in a memory buffer. The memory buffer is updated after every transaction. The
contents of the memory buffer are written into the file when the bank is closed.
Design a data management structure of the bank with several customers. The bank performs
�deposit� and �withdraw� transactions by using Java I/O streams.
Use the SimpleClient.java and SimpleServer.java files (Location:
/global_ro/rekha/B241/assignment) as a base for creating your own Client and Server
windows. Make the necessary changes to the files for them to work within your programs.
Tasks:
- Create a non-graphical user interface to be able to
o enter customer�s data
o display customer�s personal and account data after every transaction
- Write a JAVA program to read and write customers data from/to a file.
- Create a client � server networking environment using Java�s networking capabilities
such that data is entered through the server window and displayed by the client in the
client window.

Answer 1

Ela re si k eimaste k sinonomatoi...anyway...could you pleaze help me with my assignment...my other problem is that i've writen some more code for the 3rd part where it says add some more fields for the customers.I save them in a file and i restore them but i dont know how can i call them when the bank is opened....here's the rest of the code....
import java.io.*;
public class UserInfo {
public static void main(String[] args)
throws IOException {
     String k,l,m,n,o,p,q,r;
BufferedReader stdin = new BufferedReader(
new InputStreamReader(System.in));
System.out.print("First name:");
     k=stdin.readLine();
     System.out.print("Last name:");
     l=stdin.readLine();
     System.out.print("D.O.B:");
     m=stdin.readLine();
     System.out.print("Address:");
     n=stdin.readLine();
     System.out.print("Town:");
     o=stdin.readLine();
     System.out.print("Postcode:");
     p=stdin.readLine();
     System.out.print("Phone:");
     q=stdin.readLine();
     System.out.print("E-Mail:");
     r=stdin.readLine();
     try {
DataOutputStream out = new DataOutputStream(
new BufferedOutputStream(
new FileOutputStream("Data.txt")));
     out.writeUTF(k);
     out.writeUTF(l);
     out.writeUTF(m);
     out.writeUTF(n);
     out.writeUTF(o);
     out.writeUTF(p);
     out.writeUTF(q);
     out.writeUTF(r);
     out.close();
     DataInputStream in = new DataInputStream(
new BufferedInputStream(
new FileInputStream("Data.txt")));
     System.out.println(in.readUTF());
System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     } catch (NumberFormatException e) {
     System.out.println(e);
}