Need help with code pleazzz

Hi,

Please read this code carefully and especially the comments I added :

import java.applet.Applet;

import java.awt.Button;

import java.awt.Color;

import java.awt.Component;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.Insets;

import java.awt.Label;

import java.awt.LayoutManager;

import java.awt.TextArea;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JOptionPane;

public class MortgageAppletGUI extends Applet{

Button calculateButton;

TextField principalField;

TextField interestField;

TextField termField;

TextArea displayArea;

Label principal;

Label term;

Label interest;

Button clearButton;

Image house;

Font title = new Font("TimesRoman", Font.BOLD, 16);

Font text = new Font("Courier", Font.BOLD, 12);

double monthlyInt;

double monthlyPayment;

int months=12;

double interestPayment;

double principalPayment;

double remainingBalance;

public void init() {

MortgageAppletLayout customLayout = new MortgageAppletLayout();

setFont(new Font("Helvetica", Font.PLAIN, 12));

setLayout(customLayout);

calculateButton = new Button("Calculate");

calculateButton.addActionListener(new CalculateActionListener());/////////////////////change here : code added

add(calculateButton);

principalField = new TextField(20);//change here

add(principalField);

interestField = new TextField(20);

add(interestField);

termField = new TextField(20);

add(termField);

displayArea = new TextArea();

add(displayArea);

principal = new Label("Principal");

add(principal);

term = new Label("Term");

add(term);

interest = new Label("Interest");

add(interest);

clearButton = new Button("Clear");

clearButton.addActionListener(new CancelActionListener());////////change here : code added

add(clearButton);

setSize(getPreferredSize());

house = getImage(getCodeBase(), "house.jpg");

}

class CalculateActionListener implements ActionListener{

public void actionPerformed(ActionEvent e) {

String userInputprincipal = principalField.getText();

String userInputinterest = interestField.getText();

String userInputterm = termField.getText();

double userInputprincipalD=0;

double userInputinterestD=0;

double userInputtermD=0;

try {

userInputprincipalD = Double.parseDouble(userInputprincipal);///////////

} catch (Exception ex) {

JOptionPane.showMessageDialog(null, "Error principalField", "title", JOptionPane.ERROR_MESSAGE);

principalField.requestFocus();

return;

}

try {

userInputinterestD = Double.parseDouble(userInputinterest);/////////

} catch (Exception ex) {

JOptionPane.showMessageDialog(null, "Error interestField", "title", JOptionPane.ERROR_MESSAGE);

interestField.requestFocus();

return;

}

try {

userInputtermD = Double.parseDouble(userInputterm);///////////

} catch (Exception ex) {

JOptionPane.showMessageDialog(null, "Error termField", "title", JOptionPane.ERROR_MESSAGE);

termField.requestFocus();

return;

}

// Display principal, interest, and loan balance of entire term

monthlyInt = userInputinterestD / 12;

monthlyPayment = (userInputprincipalD * monthlyInt) / (1 - Math.pow(1 / (1 + monthlyInt), userInputtermD * 12));

for (int i = 1; i <= months; ++i) {

interestPayment = userInputprincipalD * monthlyInt;

principalPayment = monthlyPayment - interestPayment;

remainingBalance = userInputprincipalD - principalPayment;

displayArea.setText("#" + i + "\tP=" + (principalPayment) + "\tI=" + (interestPayment)

+ (interestPayment < 1 ? "\t\t\tB=" : "\t\t\tB=") // use tabs based on format of interest

+ (remainingBalance));

try {

Thread.currentThread().sleep(200);

} catch (InterruptedException ie) {

// TODO Auto-generated catch block

ie.printStackTrace();

} // slows down the page

//principal -= principalPayment; // calculate until payments are done ############## HERE A PROBLEM :

}

}

}

class CancelActionListener implements ActionListener{

public void actionPerformed(ActionEvent e) {

principalField.setText("");

interestField.setText("");

termField.setText("");

displayArea.setText("");

}

}

public void paint(Graphics g) {

// Display program info

g.drawImage(house, 10, 5, this);

g.setColor(Color.green);

g.drawLine(20, 4, 230, 4);

g.setColor(Color.red);

g.setFont(title);

g.drawString("\tMortgage Loan Calculator", 10, 17);

g.setColor(Color.black);

g.setFont(text);

g.drawString("\tCreated by Me", 10, 30);

}

public static void main(String args[]) {

MortgageAppletGUI applet = new MortgageAppletGUI();

Frame window = new Frame("MortgageApplet");

window.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

applet.init();

window.add("Center", applet);

window.pack();

window.setVisible(true);

}

}

class MortgageAppletLayout implements LayoutManager {

public MortgageAppletLayout() {

}

public void addLayoutComponent(String name, Component comp) {

}

public void removeLayoutComponent(Component comp) {

}

public Dimension preferredLayoutSize(Container parent) {

Dimension dim = new Dimension(0, 0);

Insets insets = parent.getInsets();

dim.width = 469 + insets.left + insets.right;

dim.height = 311 + insets.top + insets.bottom;

return dim;

}

public Dimension minimumLayoutSize(Container parent) {

Dimension dim = new Dimension(0, 0);

return dim;

}

public void layoutContainer(Container parent) {

Insets insets = parent.getInsets();

Component c;

c = parent.getComponent(0);

if (c.isVisible()) {

c.setBounds(insets.left + 8, insets.top + 280, 72, 24);

}

c = parent.getComponent(1);

if (c.isVisible()) {

c.setBounds(insets.left + 80, insets.top + 104, 72, 24);

}

c = parent.getComponent(2);

if (c.isVisible()) {

c.setBounds(insets.left + 80, insets.top + 128, 72, 24);

}

c = parent.getComponent(3);

if (c.isVisible()) {

c.setBounds(insets.left + 80, insets.top + 152, 72, 24);

}

c = parent.getComponent(4);

if (c.isVisible()) {

c.setBounds(insets.left + 176, insets.top + 88, 280, 216);

}

c = parent.getComponent(5);

if (c.isVisible()) {

c.setBounds(insets.left + 8, insets.top + 104, 72, 24);

}

c = parent.getComponent(6);

if (c.isVisible()) {

c.setBounds(insets.left + 8, insets.top + 152, 72, 24);

}

c = parent.getComponent(7);

if (c.isVisible()) {

c.setBounds(insets.left + 8, insets.top + 128, 72, 24);

}

c = parent.getComponent(8);

if (c.isVisible()) {

c.setBounds(insets.left + 88, insets.top + 280, 72, 24);

}

}

}

Hope That Helps

java_2006a at 2007-7-12 3:04:43 >