Week2.Java

/*

Week Two Individual Assignment - POS 407

Requirements: Write the program in Java with a graphical user interface

and have it calculate and display the mortgage payment amount

from user input of the amount of the mortgage, the term of the

mortgage, and the interest rate of the mortgage. Allow the user

to loop back and enter new data or quit.

Please insert comments in the program to document the program.

Resulting functionality: Program executes with baseline values that the user can edit

multiple times. Tabbing or pressing Enter after user's entry recalculates payment.

Tool tips included to assist in user understanding of required inputs.

Incorrect entries (alpha characters) are ignored.

Exit via window close.

Date Development Start: November 7, 2006

Date Development End: November 11, 2006

Revision 4

*/

//Import Libraries

import java.awt.*;

import javax.swing.*;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeEvent;

import java.text.*;

public class week2mp extends JPanel

implements PropertyChangeListener {

//initial or default Values for the form fields

private double mortgage = 200000;//Default mortgage amount

private double interestrate = 5.75; //Default interest rate

private int mortgageTerm = 30; //Default mortgage term in years

//Set field labels

private JLabel mortgageLabel;

private JLabel interestrateLabel;

private JLabel mortgageTermLabel;

private JLabel paymentLabel;

//Set values for the labels

private static String mortgageString = "Mortgage Amount: $"; //Set label for mortgage amount

private static String interestrateString = "Interest Rate: "; //Set label for interest rate

private static String mortgageTermString = "Mortgage Term: "; //Set label for mortgage Term

private static String paymentString = "Your Monthly Payment: "; //Set label for mortgage payment

//JFormattedTextField supports formatting arbitrary values, as well as retrieving an object

//once the user has edited the text.

private JFormattedTextField mortgageField;//Mortgage Amount

private JFormattedTextField interestrateField;//interest rate

private JFormattedTextField mortgageTermField;// Mortgage term

private JFormattedTextField paymentField;//Monthly payment

//NumberFormat is the base class for all number formats. Numberformat provides the interface for formatting and parsing numbers.

//NumberFormat also provides methods for determining which locales have number formats, and what their names are.

private NumberFormat mortgageFormat;//Mortgage amount

private NumberFormat percentFormat;//Interest Rate

private NumberFormat paymentFormat;//MOnthyl payment

public week2mp() {

super(new BorderLayout());

setUpFormats();

double payment = computePayment(mortgage,

interestrate,

mortgageTerm);

//Create the labels.

mortgageLabel = new JLabel(mortgageString);

interestrateLabel = new JLabel(interestrateString);

mortgageTermLabel = new JLabel(mortgageTermString);

paymentLabel = new JLabel(paymentString);

//Create the text fields and set them up.

//Mortgage

mortgageField = new JFormattedTextField(mortgageFormat);

mortgageField.setValue(new Double(mortgage));

mortgageField.setColumns(10);

mortgageField.setToolTipText("Please enter the amount borrowed without a dollar sign");//tip appears on mouse over

mortgageField.addPropertyChangeListener("value", this);//checks for user input

//Interest Rate

interestrateField = new JFormattedTextField(percentFormat);

interestrateField.setValue(new Double(interestrate));

interestrateField.setColumns(5);

interestrateField.setToolTipText("Please enter the interest rate of the mortgage without the percentage symbol");//tip appears on mouse over

interestrateField.addPropertyChangeListener("value", this);//checks for user input