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Program to create GUI for Bank Account Simulation

Program to create GUI for Bank Account Simulation

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.";
        }
}