Question

You will be writing a small bank application. There will be two applications to this project – a client and a teller / administrative application with different functionalities between the two. As their names suggest, the client application will be tailored for customers of the bank, and the other for the employees of the bank.

For your client side application, a client should be able to “log into” the program by providing a social security number. The program should only load information pertaining to the current user. A user should be able to see a list of his or her account, and view details of the accounts – balance, account type, whether it’s frozen… A user should be able to change his or her phone number and address, but not other information (name, ssn, or credit score). A user should be able to make deposits or withdrawals and make payments towards a loan. A user may request a loan, but may only have one outstanding request for a loan.

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class GuiAccTest extends Frame implements ActionListener
{
        Label lab=new Label("                                                                                                                                                                 ");
        Label lab1=new Label("                                                                                                                                                                 ");
        TextField t[]=new TextField [4];
        Label l[]=new Label [4];
        Button but=new Button("Create Account");
        Button but1=new Button("Test Account");
        BankAccount b;
        GuiAccTest()
        {
                addWindowListener(new NewWindowAdapter());
                setLayout(new GridLayout(2,0));
                Panel p=new Panel();
                Panel p1=new Panel();
                but.addActionListener(this);
                but1.addActionListener(this);
                p.setLayout(new GridLayout(5,2));
                p1.add(lab1);
                p1.add(lab);
                l[0]=new Label("Account Number");
                l[1]=new Label("Initial Balance");
                l[2]=new Label("Deposit Amount");
                l[3]=new Label("Withdraw Amount");
                for(int i=0;i<4;i++)
                {
                        t[i]=new TextField(10);
                        p.add(l[i]);
                        p.add(t[i]);
                }
                p.add(but);
                p.add(but1);
                but1.setVisible(false);
                l[2].setVisible(false);
                l[3].setVisible(false);
                t[2].setVisible(false);
                t[3].setVisible(false);
                add(p);
                add(p1);
        }
        String testAccount(int d_amt,int w_amt)
        {
                String msg;
                b.deposit(d_amt);
                msg="Transaction Succesful";
                try
                {
                        b.withdraw(w_amt);
                }catch(FundsInsufficientException fe)
                {
                        fe=new FundsInsufficientException(b.amount,w_amt);
                        msg=String.valueOf(fe);
                }
                return msg;
        }
        public void actionPerformed(ActionEvent ae)
        {
                String str=ae.getActionCommand();
                if(str.equals("Create Account"))
                {
                        b=new BankAccount(Integer.parseInt(t[0].getText()),Integer.parseInt(t[1].getText()));
                        but1.setVisible(true);
                        l[2].setVisible(true);
                        l[3].setVisible(true);
                        t[2].setVisible(true);
                        t[3].setVisible(true);
                        but.setVisible(false);
                        l[0].setVisible(false);
                        l[1].setVisible(false);
                        t[0].setVisible(false);
                        t[1].setVisible(false);
                        lab1.setText("Account : "+b.accnum+", Current Balance : "+b.amount);
                        return;
                }
                else
                {
                        lab.setText(testAccount(Integer.parseInt(t[2].getText()),Integer.parseInt(t[3].getText())));
                        lab1.setText("Account : "+b.accnum+", Current Balance : "+b.amount);
                }
        }
        public static void main(String arg[])
        {
                GuiAccTest at=new GuiAccTest();
                at.setTitle("Bank Account Tester");
                at.setSize(600,200);
                at.setVisible(true);
        }
}
class NewWindowAdapter extends WindowAdapter
{
        public void windowClosing(WindowEvent we)
        {
                System.exit(0);
        }
}
class BankAccount
{
        int accnum;
        int amount;
        BankAccount(int num,int amt)
        {
                accnum=num;
                amount=amt;
        }
        public void deposit(int amt)
        {
                amount=amount+amt;
        }
        public void withdraw(int amt) throws FundsInsufficientException
        {
                if(amt>amount)
                        throw new FundsInsufficientException(amount,amt);
                else
                        amount=amount-amt;
        }
}
class FundsInsufficientException extends Exception
{
        int balance;
        int withdraw_amount;
        FundsInsufficientException(int bal,int w_amt)
        {
                balance=bal;
                withdraw_amount=w_amt;
        }
        public String toString()
        {
                return "Your withdraw amount ("+withdraw_amount+") is less than the balance ("+balance+"). No withdrawal was recorded.";
        }
}