I have my program working while I am using the drop down menue, However I want to be able to select the JCheckBox and it will allow me to enter any amounts and it will do the math and fill in the monthly payment and the chart. here is my program:
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.math.*;
public class scroll2t extends JFrame implements ActionListener, ItemListener
{//Beginning of Program
// Fields for Principle
JPanel row1 = new JPanel();
JLabel dollar = new JLabel("How much are you borrowing?");
JTextField money = new JTextField(" ", 15);
// Fields for Term and Rate
JPanel row2 = new JPanel();
JLabel choice = new JLabel("Select Year & Rate:");
JCheckBox altchoice = new JCheckBox("Alt. Method");
JTextField YR = new JTextField(" ", 4);
JTextField RT = new JTextField(" ", 4);
//Jcombobox R=rate,Y=year
String[] RY =
{"7 years at 5.35%", "15 years at 5.5 %", "30 years at 5.75%", " "};
JComboBox mortgage = new JComboBox(RY);
// Fields for Payment
JPanel row3 = new JPanel();
JLabel payment = new JLabel("Your monthly payment will be:");
JTextField owe = new JTextField(" ", 15);
//Scroll Pane and Text Area
JPanel row4 = new JPanel();
JLabel amortization = new JLabel("Amortization:");
JTextArea chart = new JTextArea(" ", 7, 22);
JScrollPane scroll = new JScrollPane(chart,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
StringBuffer amt = new StringBuffer();
Container pane = getContentPane();
FlowLayout flow = new FlowLayout(FlowLayout.LEFT);
JButton Cal = new JButton("Calculate");
public scroll2t()
{ //Start of JFrame
// Title and Exit of JFrame
super("Q's Mortgage and Amortization Calculator");
setSize(475, 328);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//JFrame layout
pane.setLayout(flow);
//Input output fields added to JFrame
row1.add(dollar);
row1.add(money);
pane.add(row1);
mortgage.setSelectedIndex(3);
mortgage.addActionListener(this);
row2.add(altchoice);
altchoice.addItemListener(this);
row2.add(choice);
YR.setEditable(false);
RT.setEditable(false);
row2.add(YR);
row2.add(RT);
row2.add(mortgage);
pane.add(row2);
row3.add(payment);
row3.add(owe);
pane.add(row3);
owe.setEditable(false);
//Scroll Pane added to JFrame
row4.add(amortization);
chart.setEditable(false);
row4.add(scroll);
pane.add(row4);
//Executable Button- Clear,Exit, Calculate
JPanel row5 = new JPanel();
JButton clear = new JButton("Clear");
clear.addActionListener(this);
row5.add(clear);
pane.add(row5);
JButton exit = new JButton("Exit");
exit.addActionListener(this);
row5.add(exit);
Cal.setEnabled(false);
row5.add(Cal);
pane.add(row5);
//Column Titles for Text Area
amt.append("Pmt#\tPrincipal\tInterest\tBalance\n");
chart.setText(amt.toString());
setContentPane(pane);
setVisible(true);
} //End of JFrame
public void itemStateChanged(ItemEvent ie)
{
int status = ie.getStateChange();
if (status == ItemEvent.SELECTED)
{
mortgage.setEnabled(false);
YR.setEditable(true);
RT.setEditable(true);
Cal.setEnabled(true);
}
else
{
mortgage.setEnabled(true);
YR.setEditable(false);
RT.setEditable(false);
Cal.setEnabled(false);
}
}
public void actionPerformed(ActionEvent ae)//Calculations and Button executions
{ //Start actionPerformed
String command = ae.getActionCommand();
// Exit program
if (command == "Exit")System.exit(0);
//Define variables loan1 //Define loan2
double Principal = 0; int Year2 = 15;
int Year = 7; double Rate2 = 0.055;
double Rate = 0.0535; int Year3 = 30;
double Interest = 0; double Rate3 = 0.0575;
double Monthly = 0;
NumberFormat currency =
NumberFormat.getCurrencyInstance();
// Cal button
if (command== "Calculate")
{
int y = Integer.parseInt(YR.getText());
double r = Double.parseDouble(RT.getText())/1200;
double P = Double.parseDouble(money.getText());
double In = r / 100 / 12.0;
double M = P * (In / (1 - Math.pow(In + 1, -12.0 * y)));
owe.setText(currency.format(Double.toString(M)));
for (int i=0; i<y*12; i++)
{
double interestAccrued=Principal*Interest;
double principalPaid=Monthly-interestAccrued;
amt.append(i+1 + "\t" +currency.format(principalPaid)
+ "\t" + currency.format(interestAccrued)
+ "\t" + currency.format(Principal) + "\n");
chart.setText(amt.toString());
Principal=Principal+interestAccrued-Monthly;
}
}
// Clear fields
if (command == "Clear")
{
Principal = 0.0F;
money.setText(null);
mortgage.setSelectedIndex(3);
owe.setText(null);
chart.setText(null);
}
// check box
//Execute Combo Array 0
if(mortgage.getSelectedIndex()==0)
{
//mortgage.setSelectedIndex(0);
mortgage.getSelectedItem().toString();
Principal = Double.parseDouble(money.getText());
Interest = Rate / 12.0;
Monthly = Principal * (Interest / (1 - Math.pow(Interest + 1, -12.0 * Year)));
owe.setText(currency.format(Monthly));
for (int i=0; i<Year*12; i++)
{
double interestAccrued=Principal*Interest;
double principalPaid=Monthly-interestAccrued;
amt.append(i+1 + "\t" +currency.format(principalPaid)
+ "\t" + currency.format(interestAccrued)
+ "\t" + currency.format(Principal) + "\n");
chart.setText(amt.toString());
Principal=Principal+interestAccrued-Monthly;
}
}
//Execute Combo Array 1
if(mortgage.getSelectedIndex()==1)
{
//mortgage.setSelectedIndex(1);
mortgage.getSelectedItem().toString();
Principal = Double.parseDouble(money.getText());
Interest = Rate2 / 12.0;
Monthly = Principal * (Interest / (1 - Math.pow(Interest + 1, -12.0 * Year2)));
owe.setText(currency.format(Monthly));
for (int i=0; i<Year2*12; i++)
{
double interestAccrued=Principal*Interest;
double principalPaid=Monthly-interestAccrued;
amt.append(i+1 + "\t" +currency.format(principalPaid)
+ "\t" + currency.format(interestAccrued)
+ "\t" + currency.format(Principal) + "\n");
chart.setText(amt.toString());
Principal=Principal+interestAccrued-Monthly;
}
}
//Execute Combo Array 2
if(mortgage.getSelectedIndex()==2)
{
//mortgage.setSelectedIndex(2);
mortgage.getSelectedItem().toString();
Principal = Double.parseDouble(money.getText());
Interest = Rate3 / 12.0;
Monthly = Principal * (Interest / (1 - Math.pow(Interest + 1, -12.0 * Year3)));
owe.setText(currency.format(Monthly));
for (int i=0; i<Year3*12; i++)
{
double interestAccrued=Principal*Interest;
double principalPaid=Monthly-interestAccrued;
amt.append(i+1 + "\t" +currency.format(principalPaid)
+ "\t" + currency.format(interestAccrued)
+ "\t" + currency.format(Principal) + "\n");
chart.setText(amt.toString());
Principal=Principal+interestAccrued-Monthly;
}
}
} //End actionPerformed
public static void main(String args[])throws IOException
{
scroll2 Calc = new scroll2();
}
}
