Help with Button

You are right I copied parts of the code. I am still new to Java and I thought that using pieces of people's code was an acceptable practice. I would like to apologize if that was wrong. I did however post the wrong code. I posted the code word for word and I meant to post my own code that I used information from your code in. If this is wrong I will take the information I used out because I seriously don't want to cheat. The code below is my own that I have been modifying for the past 8 weeks in a Java programming class. The class is on line so it is hard to get help from classmates.

import javax.swing.JButton;

import javax.swing.JPanel;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.JOptionPane;

import java.text.DecimalFormat; //this class displays decimal format

public class Mortgage2 extends JPanel implements ActionListener

{

JFrame frame = new JFrame ("Mortgage Calculator");

JPanel panel = new JPanel ();

JFrame frame = new JFrame ("Please Select a Loan Term");

JButton mort1 = new JButton ("7 Year at 5.35%");

JButton mort2 = new JButton ("15 Year at 5.5%");

JButton mort3 = new JButton ("30 Year at 5.75%");

JButton exit = new JButton ("Exit the Calculator");

JLabel pay = new JLabel ("The Monthly Payment");

JScrollPane scroll = new JScrollPane(pane);

public Mortgage2

{

super ("Calculator");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

panel.setLayout(new GridLayout(5,2));

panel.add(pay);

panel.add(exit);

panel.add(mort1);

panel.add(mort2);

panel.add(mort3);

mort1.addActionListener(this);

mort2.addActionListener(this);

mort3.addActionListener(this);

}//end Mortgage2

public static void main(String[] args)

{

frame.getContentPane().add(panel, BorderLayout.CENTER);

frame.setSize(400,300);

frame.setLocation(200,100);

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

//declare class variables values

mortgage = 200000.00;

principal = 200000.00; //the current mortgage amount of the loan

interestRateYears = .0575;

interestRateMonths = (interestRateYears / 12) / 100;

termYears = 30;

termMonths = (termYears * 12);

monthlyInterestPayment = 0;

monthlyPrincipalPayment = 0;

balance = principal;

linecount = 15;

//this text formats the numbers to display two decimal places

java.text.DecimalFormat dec = new java.text.DecimalFormat ("###.00");

//calculations

mortgage = ((200000*.0575)+200000)/360; //monthly payment from week 2 program

monthlyPayment = (principal * interestRateMonths) /

(1 - Math.pow(1 + interestRateMonths, - termMonths)); //calculation retrieved from Dr math

// formula to calculate monthly interest and principal payments

monthlyInterestPayment = (balance * interestRateMonths);

monthlyPrincipalPayment = (monthlyPayment - monthlyInterestPayment); //retrieved from Dr math

// start while loop

while (termMonths > 0)

{

// information to display

System.out.println(termMonths + "\t\t$" + dec.format(monthlyPrincipalPayment) +

"\t\t$" + dec.format(monthlyInterestPayment) +

"\t\t$" + dec.format(balance));

// decrement months

termMonths--;

// calculate interest and principal payments

monthlyInterestPayment = (balance * interestRateMonths);

monthlyPrincipalPayment = (monthlyPayment - monthlyInterestPayment);

balance = (balance - monthlyInterestPayment);

// these conditional statements cause the results to pause

if(linecount == 20)

{

linecount = 0;

try

{

Thread.sleep(3000);// pause to last three seconds

}

catch (InterruptedException e)

{

}

}// end if

else

{

linecount++;

}// end else

}// end while

} // end main

} //end program

Kaleia at 2007-7-16 0:03:39 >

Technically there is nothing wrong in using code that is in the 'public domain',

and, when you are researching a problem, it is working code you seek.

However, when you are doing this as a learning exercise, you will not gain any

knowledge form copy / get someone to fix / submit. The whole point of this, and

any exercise, is for you to learn something that you can carry forward into your

next assignment. If you do not want to do that, then what is the point of doing

the course?

Now, with your own code - for the moment forget everything to do with the

calculation and output.

Just concentrate on the getting the gui right.

Start by drawing it on paper, with these in mind

1)

What data do you require from the user?

years&rate

amount

other data?

2)

How are you going to get that data?

a JComboBox might be better than JButtons for year@rate

a JTextField for amount

others?

3)

how are you going to display the output?

perhaps just a JTextArea will do for this

or a JTabel, if adventurous

4) other incidentals?

a Jbutton to trigger the calculation/display?

a Jbutton to exit?

a JLabel for messages - perhaps the textArea will do for this?

you will probably need to nest some layout managers to get it all looking right

here are a couple of links

http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html

http://java.sun.com/docs/books/tutorial/uiswing/layout/visual.html

when you have the look right, add listener code for the buttons,

but just put some println() statements at first - just to make sure the listeners are firing.

when OK, add the calculation code (with the output code).

Don't worry about the format of the output, just get the result correct.

When the result is correct you can then look at the formatting the output

Have a go at it, and post questions relating to specific problems.

Michael_Dunna at 2007-7-16 0:03:39 >