Create a Swing applet that calculates the current balance in a checking account
ID: 3534140 • Letter: C
Question
Create a Swing applet that calculates the current balance in a checking account in a checking account in a JTextField. The user enters the beginning balance, check amount, and deposit amount in separate JTextFields with appropriate JLabels. After the applet calculates the current balance, reposition the JTextFields and JLabels so that the beginning balance appears on the first line, the check and deposit amounts appear on the second line, and the new balance appears on the third line. Save the program in Jcalculate.java.
Explanation / Answer
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.";
}
}