Results don't populate text field

Question

The program compiles and runs but the results don't populate the screen please help. i know I did,t highlight the code but I'm heading out I'm late for work.
import javax.swing.*;
import java.awt.*;
import java.text.DecimalFormat;
import java.awt.event.*;
import java.text.NumberFormat;
class Mortgage extends JFrame implements ActionListener {
JTextField prinBal=new JTextField(10);
JComboBox cboRate = new JComboBox();
JButton send = new JButton("Calculate");
JTextArea message = new JTextArea(10, 50);
JScrollPane scroll = new JScrollPane(message,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
JPanel row2 = new JPanel();
FlowLayout flow = new FlowLayout(FlowLayout.LEFT);
JLabel toLabel = new JLabel("Mortgage amount:");
JPanel row3 = new JPanel();
JLabel messageLabel = new JLabel("Schedule:");
JPanel row4 = new JPanel();
/* set values */
int loanTermMonths = 0;
int monthlyPaymentInterest = 0;
int remainingLoanBalance = 0;
int interestRateMonthly = 0;
int monthlyPaymentPrincipal = 0;
int monthlyPayment = 0;
NumberFormat dec = NumberFormat.getInstance();
/*set values*/
Mortgage() {
super("Mortgage");
setSize(400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = getContentPane();
pane.setLayout(flow);
row2.add(toLabel);
// JTextField to = new JTextField(10);
row2.add(prinBal);
cboRate.addItem("5.5% 7 Years");
cboRate.addItem("5.5% 15 Years");
cboRate.addItem("5.75% 30 Years");
row2.add(cboRate);
pane.add(row2);
row3.add(messageLabel);
message.setLineWrap(true);
message.setWrapStyleWord(true);
row3.add(scroll);
pane.add(row3);
send.addActionListener(this);
row4.add(send);
pane.add(row4);
setContentPane(pane);
setVisible(true);
} //constructor close
public void actionPerformed(ActionEvent e){
double amount;
double rate;
int numPeriods;
String amort;
rate =0.0;
numPeriods = 0;
amount = 0.0;
Object source = e.getSource();
if (source == send) {
amount = Double.parseDouble(prinBal.getText());
if (cboRate.getSelectedItem() == "5.5% 7 Years") {
rate=5.5;
numPeriods = 7*12;
else if (cboRate.getSelectedItem() == "5.5% 15 Years") {
rate=5.5;
numPeriods = 15*12;
else if (cboRate.getSelectedItem() == "5.75% 30 Years") {
rate=5.75;
numPeriods = 30*12;
computePayment(amount, rate, numPeriods);
//Compute the monthly payment based on the loan amount,
//APR, and length of loan.
private void computePayment(double loanAmt, double rate, int numPeriods) {
double I, partial1, denominator, answer;
String localAmort;
localAmort = message.getText();
localAmort =("\nLoan\tMonthly\tInterest\tRemaining"); // format column headers for results to be displayed
//localAmort = localAmort + ("Months\tPayment\t\tPayment\t\tLoan");
//localAmort = localAmort + ("Remaining\tPrincipal\tMonthly\t\tBalance");
localAmort =localAmort +("-------------------------------------");
System.out.println(loanAmt + " : " + rate + " : " + numPeriods);
if (rate > 0.01) {
I = rate / 100.0 / 12.0; //get monthly rate from annual
partial1 = Math.pow((1 + I), (0.0 - numPeriods));
denominator = (1 - partial1) / I;
} else { //rate ~= 0
denominator = numPeriods;
answer = (-1 * loanAmt) / denominator;
localAmort = localAmort + "dd";
while (loanTermMonths > 0) // start while loop
monthlyPaymentInterest = (remainingLoanBalance * interestRateMonthly); // Calculate H = R x I
monthlyPaymentPrincipal = (monthlyPayment - monthlyPaymentInterest); // Calculate C = P - H
remainingLoanBalance = (remainingLoanBalance - monthlyPaymentPrincipal); // Calculate R = R - C
// H = monthlyPaymentInterest
// R = remainingLoanBalance
// C = monthlyPaymentPrincipal
// I = interestRateMonthly
int Months = loanTermMonths;
double Principal = monthlyPaymentPrincipal;
double Interest = monthlyPaymentInterest;
double Balance = remainingLoanBalance;
System.out.println(Months + " " + dec.format(Principal) + " " + dec.format(Interest) + " " + dec.format(Balance));
if(loanTermMonths % 10 == 0) // pause results after 10 lines
try {
System.out.println("\n\"Please press Enter to continue\"");
System.in.read();
catch(Exception e) {
// end if
loanTermMonths --;
} // end while
     public static void main(String[] arguments) {
          Mortgage mail = new Mortgage();
}

Answer 1

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