import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.awt.event.ActionListener;

public class RobertWK5 extends JPanel implements ActionListener {

//Serial Version ID
private static final long serialVersionUID = 1L;
// arrays
String[] loan = {"7 yrs @ 5.35%", "15 yrs @ 5.5%", "30 yrs @ 5.75%", "Select one"};
int[] term = {7, 15, 30};
double[] apr = {5.35, 5.5, 5.75};
int graphAngle = 0;// Graph

//loan values
private double loanAmount;
private int loanIndex;

//Labels and their fields
private JLabel loanAmountLabel = new JLabel("Loan Amount: ");
private JLabel monthlyPaymentLabel = new JLabel("Monthly Payments: ");
private JLabel loanLabel = new JLabel("Customized Input: ");
private JLabel termLabel = new JLabel(" Term in years: ");
private JLabel aprLabel = new JLabel(" Interest: ");
private JLabel schedulePayLabel = new JLabel("Payment# New Balance Interest Paid");
//Formats to format and parse numbers
private NumberFormat loanAmountFormat;
private NumberFormat monthlyPaymentFormat;
private NumberFormat termFormat;
private NumberFormat aprFormat;

//Fields for user input and output
private JFormattedTextField loanAmountField;
private JComboBox loanList;
private JFormattedTextField monthlyPaymentField;
private JFormattedTextField termField;
private JFormattedTextField aprField;

//Text field for scheduled payments with scroll pane
JTextArea scheduleTextArea = new JTextArea();
JScrollPane scheduleScrollPane1 = new JScrollPane(scheduleTextArea);

//Menu for clear and exit
JMenuBar myMenuBar = new JMenuBar();
JMenu myMenu = new JMenu("Menu");
JMenuItem calcMenuItem = new JMenuItem("Calculate");
JMenuItem clearMenuItem = new JMenuItem("Clear");
JMenuItem exitMenuItem = new JMenuItem("Exit");

//Buttons
JButton button1 = new JButton("Calculate");

//Panels and grids
JPanel outerPanel = new JPanel(new GridLayout(4,0));
JPanel innerPanel = new JPanel(new BorderLayout());
JPanel myPanel = new JPanel(new GridLayout(3,4));
JPanel buttonPanel = new JPanel(new BorderLayout());
JPanel myChart = new JPanel();
//Graph frame
JFrame graphFrame = new JFrame("Graph");
//constructor Add GUI items
public RobertWK5() {

KeyAdapter myKeyAdapter = new KeyAdapter(){
public void keyTyped(KeyEvent arg0)
{
char key = arg0.getKeyChar();
//Allows numbers and dots
if (!(Character.isDigit(key) || (key == KeyEvent.VK_PERIOD) ||
(key == KeyEvent.VK_BACK_SPACE) || (key == KeyEvent.VK_DELETE)))
{
arg0.consume();
}
if (loanIndex < 3)
{
if (aprField.isFocusOwner() || termField.isFocusOwner())
{
arg0.consume();
popupError(" Select the plan ");

}
}
}
};
//Action listener and comboBox
ActionListener myLoanListListener = new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JComboBox combo = (JComboBox)arg0.getSource();
loanIndex = combo.getSelectedIndex();
if (loanIndex < 3)
{
termField.setValue(0);
termField.setText("");
aprField.setValue(0);
aprField.setText("");
}
}
};
//menu
calcMenuItem.addActionListener(this);
calcMenuItem.setActionCommand("Calculate");
clearMenuItem.addActionListener(this);
clearMenuItem.setActionCommand("Clear");
exitMenuItem.addActionListener(this);
exitMenuItem.setActionCommand("Exit");

scheduleTextArea.setLineWrap(true);
scheduleTextArea.setRows(4);
scheduleTextArea.setWrapStyleWord(true);
scheduleTextArea.setEditable(false);

//Set button action
button1.addActionListener(this);
button1.setActionCommand("Calculate");

//Create the loan amount field
loanAmountFormat = NumberFormat.getInstance();
loanAmountFormat.setMaximumFractionDigits(2);
loanAmountField = new JFormattedTextField(loanAmountFormat);
loanAmountField.setValue(new Double(loanAmount));
loanAmountField.setText("");
loanAmountField.setColumns(10);
loanAmountField.addKeyListener(myKeyAdapter);
termFormat = NumberFormat.getInstance();
termFormat.setMaximumFractionDigits(0);
termField = new JFormattedTextField(termFormat);
termField.addKeyListener(myKeyAdapter);
aprFormat = NumberFormat.getInstance();
aprFormat.setMaximumFractionDigits(2);
aprField = new JFormattedTextField(aprFormat);
aprField.addKeyListener(myKeyAdapter);

//Create the Loan combo box
//Create the Monthly Payment read only field
loanList = new JComboBox(loan);
loanList.addActionListener(myLoanListListener);
loanList.setSelectedIndex(3);
monthlyPaymentFormat = NumberFormat.getCurrencyInstance();
monthlyPaymentField = new JFormattedTextField(monthlyPaymentFormat);
Double payment = 0.0;
monthlyPaymentField.setValue(new Double(payment ));
monthlyPaymentField.setColumns(10);
monthlyPaymentField.setEditable(false);

//Add all the panels
myPanel.add(loanAmountLabel);
myPanel.add(loanAmountField);
myPanel.add(termLabel);
myPanel.add(termField);
myPanel.add(loanLabel);
myPanel.add(loanList);
myPanel.add(aprLabel);
myPanel.add(aprField);
myPanel.add(monthlyPaymentLabel);
myPanel.add(monthlyPaymentField);
myMenu.add(calcMenuItem);
myMenu.add(clearMenuItem);
myMenu.add(exitMenuItem);
myMenuBar.add(myMenu);
innerPanel.add(myMenuBar, BorderLayout.EAST);
innerPanel.add(myPanel, BorderLayout.SOUTH);
buttonPanel.add(button1, BorderLayout.EAST);
buttonPanel.setBorder(BorderFactory.createEmptyBorder(40,20,0,20));
buttonPanel.add(schedulePayLabel, BorderLayout.SOUTH);
scheduleScrollPane1.setBorder(BorderFactory.createEmptyBorder(0,20,0,80));
outerPanel.add(innerPanel);
outerPanel.add(buttonPanel);
outerPanel.add(scheduleScrollPane1);
outerPanel.add(myChart);
add(outerPanel);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));//create border
}

//Set up our window and show it
private static void createAndShowGUI() {

//Set up the window
JFrame frame = new JFrame("Mortgage Calculator 2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
RobertWK5 newContentPane = new RobertWK5();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}

//Main function
public static void main(String[] args) {
//Create and show GUI
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}

public void actionPerformed(ActionEvent arg0) {
String cmd = arg0.getActionCommand();
if (cmd == "Exit")
{
System.exit(0);
}
if (cmd == "Clear")
{
loanList.setSelectedIndex(3);
loanAmountField.setValue(0);
loanAmountField.setText("");
termField.setValue(0);
termField.setText("");
aprField.setValue(0);
aprField.setText("");
scheduleTextArea.setText("");
monthlyPaymentField.setValue(0);
loanAmount = 0.0;
graphFrame.setVisible(false);
graphFrame.removeAll();
}
if (cmd == "Calculate")
{
// On click display the payment amount.
try {
loanAmountField.commitEdit();
} catch (ParseException e) {
popupError("The loan amount is blank");
return;
}
if (loanIndex == 3) //Select from dropdown menu
{
try {
aprField.commitEdit();
} catch (ParseException e) {
popupError("The apr is blank.");
return;
}
try {
termField.commitEdit();
} catch (ParseException e) {
popupError("The term is blank.");
return;
}
}
loanAmount = ((Number)loanAmountField.getValue()).doubleValue();
if (loanAmount > 0)
{
if (loanIndex < 3)
{
Double monthlyPayment = computePayment(loanAmount, apr[loanIndex], term[loanIndex]);
monthlyPaymentField.setValue(new Double(monthlyPayment));
graphAngle = displayAmortizationTable(term[loanIndex], apr[loanIndex], loanAmount, monthlyPayment);
}
else
{
double aprCustom = ((Number)aprField.getValue()).doubleValue();
int termCustom = ((Number)termField.getValue()).intValue();
if (termCustom == 0)
{
popupError("The term is zero.");
return;
}
Double monthlyPayment = computePayment(loanAmount, aprCustom, termCustom);
monthlyPaymentField.setValue(new Double(monthlyPayment));
graphAngle = displayAmortizationTable(termCustom, aprCustom, loanAmount, monthlyPayment);
}

}
else
{
popupError("The loan amount is zero.");
}

}
}
private Double computePayment(double loanAmount, double apr, int term) {

// method to calculate monthly payment
double monthlyPayment;
double interestRate = apr/100/12;
if (term > 0)
{
if (apr > 0)
{
monthlyPayment = (loanAmount * interestRate) /
(1 - Math.pow((1 + interestRate), -(term * 12)));
}
else
{
monthlyPayment = loanAmount / (term * 12);
}
}
else
{

monthlyPayment = loanAmount;
}
return monthlyPayment;
}

private void popupError(String error)
{
JOptionPane.showOptionDialog(null, error,
"Warning", JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE, null, null, null);
}
private int displayAmortizationTable(int term, double apr, double principalBalance, double monthlyPayment){
double totalInterest = 0;
double totalBalance = principalBalance;
if (principalBalance > 0)
{
String textOut = "";
double interestRate = apr/100/12;
for(int period = 1; period <= (term * 12); period++) {
double interestPayment;

//Amortization table
interestPayment = interestRate * principalBalance;
totalInterest = totalInterest + interestPayment;
principalBalance = principalBalance - (monthlyPayment - interestPayment);
if (Math.round(principalBalance * 100) > 0)
{
textOut = textOut + period
+ "\t" + NumberFormat.getCurrencyInstance().format(principalBalance)
+ "\t" + NumberFormat.getCurrencyInstance().format(interestPayment) + "\n";
} else {
textOut = textOut + "Final"
+ "\t" + NumberFormat.getCurrencyInstance().format(principalBalance)
+ "\t" + NumberFormat.getCurrencyInstance().format(interestPayment);
}
}
scheduleTextArea.setText(textOut);
}
double angle = ((totalInterest / (totalBalance + totalInterest)) * 360);
return (int) Math.round(angle);
}
}

This is what i have s far,what do you think?

RG 421 - Service Request SR-mf-003 - Change Request 7. This is what i'm working on, so i need a help.

thanks.

Java Program (without a graphical user interface) that will display the mortgage payment,
loan balance and interest paid over the course of the loan with a screen pause.
This change request will be to show each monthly payment and interest over the life of the mortgage.
The second change request shows the monthly payment for 3 different loans over different lengths of time
and with different interest rates.
This third change request is to print out all three mortgages over the life of the loan.
This fourth change request takes the user to the web to show an applet for the basic calulation and show
the monthly payment for what ever the user enters in the fields on the web browser.
The fifth change request asks that the user be able to select a loan product from a list ( menu ) and to
show the entire mortgage. Arrays need to be used to handle this request.
The sixth change requests asks that it allow the user to select which way they want to calculate a mortgage:
by input of the amount of the mortgage, the term of the mortgage, and the interest rate of the mortgage
payment or by input of the amount of a mortgage and then select from a menu of mortgage loans.
The seventh change request is including a graph to the mix.
*/

Mortgage Calculator - PRG 421 - Service Request SR-mf-003 - Change Request 7

so what is the right price for it? can somone tell me how much it will cost me?

Hey Rafael, if i can get it by noon tomorrow, name your price.

Thanks