//first java Applet	

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class Credit extends Applet implements ActionListener
{
  Label promptNum, promptBegBal, promptCharges, promptCredit, promptLimit, promptResult;     //Message tp porompt user
  TextField acctNum, begBal, totCharges, totCredit, limit, result;  //input values entered here
  int number, balance, charges, credit, climit, total;

  public void init()
  {

    promptNum = new Label("Account Number");
    add(promptNum);
    acctNum = new TextField(10);
    add(acctNum);
    acctNum.addActionListener(this);

    promptBegBal = new Label("Beginning Balance");
    add(promptBegBal);
    begBal = new TextField(10);
    add(begBal);
    begBal.addActionListener(this);

    promptCharges = new Label("Charges");
    add(promptCharges);
    totCharges = new TextField(10);
    add(totCharges);
    totCharges.addActionListener(this);

    promptCredit = new Label("Credit");
    add(promptCredit);
    totCredit = new TextField(10);
    add(totCredit);
    totCredit.addActionListener(this);

    promptLimit = new Label("Limit");
    add(promptLimit);
    limit = new TextField(10);
    add(limit);
    limit.addActionListener(this);

    promptResult = new Label("Result");
    add(promptResult);
    result = new TextField(10);
    add(result);
  }
  public void actionPerformed(ActionEvent e)
  {
    if (acctNum.hasFocus()) {
        number = Integer.parseInt(e.getActionCommand());
    }
    if (begBal.hasFocus()) {
        balance = Integer.parseInt(e.getActionCommand());
    }
    if (totCharges.hasFocus()) {
        charges = Integer.parseInt(e.getActionCommand());
    }
    if (totCredit.hasFocus()) {
        credit = Integer.parseInt(e.getActionCommand());
    }
    if (limit.hasFocus()) {
        climit = Integer.parseInt(e.getActionCommand());
        total = balance + charges - credit;
        result.setText(Integer.toString(total));
        if (total > climit) {
            showStatus("You have exceeded your limit!");
        }
    }
  }
}