Mortgage Calculator

I compile the java code and no problem. Then run java application and no problem. I then try to convert to Java Applet and i receive errors.

C:\AIU\MIS\Object-Oriented\Projects\Wahlen5IPSolution.java:95: cannot find symbol
symbol : method setDefaultCloseOperation(int)
location: class Wahlen5IPSolution
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
^
C:\AIU\MIS\Object-Oriented\Projects\Wahlen5IPSolution.java:134: cannot find symbol
symbol : method pack()
location: class Wahlen5IPSolution
pack();
^
2 errors

Tool completed with exit code 1


Code is below


//Import all required Packages
import javax.swing.*;
import java.awt.*;
import java.text.*;
import java.awt.event.*;


public class Wahlen5IPSolution extends JApplet implements ActionListener {


double userAmount;
double userInterest;
double userTerm;


int month = 0;
double remainBalance = 0;
double interestPayment = 0;
double principalPaid = 0;


JPanel row1;
JLabel lblAmount;
JTextField txtAmount;
JLabel lblInterest;
JTextField txtInterest;
JLabel lblTerm;
JTextField txtTerm;
JLabel lblPayment;
JTextField txtPayment;

JPanel row2;
JLabel lblHeader;
JTextArea txtResults;
JScrollPane textPane;


JPanel row3;
JButton calculateButton;
JButton clearButton;
JButton exitButton;


public void init()
{

//Instantiate GUI Components
//super("Mortgage Calculator");


// row1
row1 = new JPanel();

lblAmount = new JLabel(" Mortgage: $", JLabel.LEFT);
txtAmount = new JTextField(10);


lblInterest = new JLabel("Interest %", JLabel.LEFT);
txtInterest = new JTextField(6);

lblTerm = new JLabel("Term in Years", JLabel.LEFT);
txtTerm = new JTextField(6);

lblPayment = new JLabel("Payment:");
txtPayment = new JTextField(10);



// row2
row2 = new JPanel(new BorderLayout());

String pad = " ";
lblHeader = new JLabel("Payment #"+pad+"Payment Amount:"+pad+"Interest Paid:"+pad+"New Balance:");

txtResults = new JTextArea(10, 53);
textPane = new JScrollPane(txtResults);



//row 3
row3 = new JPanel(new GridLayout(1,3,75,1));

calculateButton = new JButton("Calculate");
clearButton = new JButton("Clear");
exitButton = new JButton("Exit");



//Build GUI

setSize(600, 250);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

row1.add(lblAmount);
row1.add(txtAmount);

row1.add(lblInterest);
row1.add(txtInterest);

row1.add(lblTerm);
row1.add(txtTerm);

row1.add(lblPayment);
row1.add(txtPayment);

txtPayment.setEditable(false);



textPane.setPreferredSize(new Dimension(610,200));
row2.add(lblHeader,BorderLayout.NORTH);
row2.add(textPane,BorderLayout.CENTER);



//Create Calculate button and add listener
calculateButton.addActionListener(this);
clearButton.addActionListener(this);
exitButton.addActionListener(this);




row3.add(exitButton);
row3.add(clearButton);
row3.add(calculateButton);
getContentPane().add(row1,BorderLayout.NORTH);
getContentPane().add(row2,BorderLayout.CENTER);
getContentPane().add(row3,BorderLayout.SOUTH);

pack();
}





//Define actions performed for buttons
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == calculateButton)
{


double balance = 0;
double monthPayment=0;



userAmount = Double.parseDouble(txtAmount.getText());

userInterest = Double.parseDouble(txtInterest.getText());

userTerm = Double.parseDouble(txtTerm.getText());



//formats answer in currency format then to string format for display
NumberFormat fmt = NumberFormat.getCurrencyInstance();
monthPayment = CalculateMonthlyPayment();
String payment = fmt.format(monthPayment);
txtPayment.setText(" "+payment);



balance = userAmount;
month = (int)userTerm * 12;

for(int index = 1; index <= month ; index++)
{
interestPayment = balance * (userInterest * .01/12);
principalPaid = monthPayment - interestPayment;
remainBalance = balance - principalPaid;


txtResults.append(" " + index + "\t\t "+ fmt.format(balance) + "\t\t"
+ fmt.format(interestPayment) + "\t\t" + fmt.format(remainBalance) + "\n");

balance = remainBalance;
}


}

else if (e.getSource() == clearButton)
{
txtAmount.setText(null);
txtPayment.setText(null);
txtResults.setText(null);
}

else if (e.getSource() == exitButton)
{
System.exit(0);
}
}


//Mortgage Payment Calculations
double CalculateMonthlyPayment()
{

return (userAmount * ((1 + (userInterest*.01)/12)-1) / (1-(Math.pow((1+(userInterest*.01)/12),-(userTerm*12)))));

}




public static void main(String[] args)
{
new Wahlen5IPSolution().setVisible(true);
}

}

Quote:

---

Wahlen5IPSolution.java:95: cannot find symbol
symbol : method setDefaultCloseOperation(int)
location: class Wahlen5IPSolution
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

---

Where is the method referred to in the error message defined? The compiler can't find it.

Quote:

---

Wahlen5IPSolution.java:134: cannot find symbol
symbol : method pack()
location: class Wahlen5IPSolution
pack();

---

Same problem. Where is the pack method defined?

Your Wahlen5IPSolution class is now extending a different class with different methods.

Thanks, You were correct. I just fixed. My last question is thus; I used Textpad linked to my java compiler. I have compiled correctly. Created a class file and finally have a html file. When I use texpad and launch the html the applet works perfectly. When I launchthe htmil file, my browser give me a a blank page. What is the secret for just clicking on the html file so it launch the java applet. Bioth files are in the same directory.

<HTML>

<HEAD>

<Title>Wahlen5IPSolutionApplet</Title>

</HEAD>

<BODY>

Here is the output of my program:
<APPLET CODE="Wahlen5IPSolution.class" WIDTH="150" HEIGHT="25">

</APPLET>

</BODY>

</HTML>

I don't see any errors in the html. One change you could make is to remove the .class in the end of the code= attribute. Some browsers have a problem with that.
Look in the browser's java console to see if there are any error messages there.