JAVA Problem Graphical Interface-Lost Help?
by Mortgage Rates on Monday, October 18th, 2010 | 1 Comment
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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class MortgageCalculator extends JFrame implements ActionListener{
private NumberFormat currency;
JFormattedTextField loanamount = new JFormattedTextField() ;
JFormattedTextField term= new JFormattedTextField();
JFormattedTextField interestrate= new JFormattedTextField();
JTextArea outputText;
private void jbInit() {
JPanel contentPane = (JPanel) getContentPane();
contentPane.setLayout(new FlowLayout());
setSize(new Dimension(400, 300));
setTitle(“This is the first frame”);
loanamount.setColumns(5);
term.setColumns(5);
interestrate.setColumns(5);
currency = NumberFormat.getCurrencyInstance();
JLabel lblterm = new JLabel(“Term of loan: “);
JLabel lblrate = new JLabel(“Rate: “);
JLabel lblamount = new JLabel(“Amount: “);
JButton btnCalculate = new JButton(“Calculate”);
JButton btnReset = new JButton(“Reset”);
JButton btnEnd = new JButton(“End”);
btnCalculate.setActionCommand(“calculate”);
btnReset.setActionCommand(“reset”);
btnEnd.setActionCommand(“end”);
btnCalculate.addActionListener(this);
btnReset.addActionListener(this);
btnEnd.addActionListener(this);
String defaultOutputMessage = “Please enter the amount of the loan” +
” the length of the loan, and the selected interest rate. Click on Calculate” +
” when done.”;
outputText = new JTextArea(defaultOutputMessage);
outputText.setColumns(35);
outputText.setRows(5);
outputText.setLineWrap(true);
outputText.setEditable(false);
outputText.setWrapStyleWord(true);
add(lblterm);
add(term);
add(lblrate);
add(interestrate);
add(lblamount);
add(loanamount);
add(btnCalculate);
add(btnReset);
add(btnEnd);
add(outputText);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if (“calculate”.equals(e.getActionCommand())) {
calculate();
}
else if (“reset”.equals(e.getActionCommand())) {
term.setText(“”);
interestrate.setText(“”);
loanamount.setText(“”);
}
else
{
System.exit(0);
}
}
public static void main(String[] args){
//variables that are to be used and the information in the program.
MortgageCalculator test = new MortgageCalculator();
test.jbInit();
}
// (Main) method that will display all of the output.
// Define the variables to be used
private void calculate()
{
double loan = Double.parseDouble(loanamount.getText());
int termlength = Integer.parseInt(term.getText());
double rate = Double.parseDouble(interestrate.getText());
double Payment = calculatePayment(loan, termlength,rate/100);
outputText.setText(“Mortgage Payment is ” + currency.format(Payment));
}
// Used to calculate the amound in the payment based on the principle, the term and the interest rate.
public static double calculatePayment(double principle, int term, double rate)
{
//Returns the amount of the mortgage and does all the fancy work for the user behind the scenes in the meanwhile exiting quietly.
return(principle * Math.pow(1+(rate/12), term) * rate/12) / (Math.pow(1 + rate/12, term) – 1);
}
}