Please Help me!!! I know this is a stupid newbie error, but I am a newbie. My program compiles and runs, but I can't get the interestP and the principalP to pass to the other class to fill the graph. I have worked on this non-stop all day.

import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.text.*;
import java.util.*;
import java.lang.*;
import javax.swing.border.*;
import javax.swing.JOptionPane;
import javax.swing.JTabbedPane;
import javax.swing.JComponent;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.text.NumberFormat;

// Create MortgageCalculator class
public class MortCal5 extends JFrame implements ActionListener
{
	//declare variables
	double principle = 0.0;
	double interest = 0.0;
	int years = 0;
	double months = 0;
	int termArray[] = {7, 15, 30};

	double[] rates;

	private double intTotal = 0.0;
	private double priTotal = 0.0;
	private double payTotal = 0.0;

	 double interestP = 0.0;
	double principalP = 0.0;

	double[] values;
	private String[] names;



	JFrame f = new JFrame();

	// Text for Mortgage
	JPanel row1 = new JPanel(); // Sets up Panels, Preselect Buttons, and Frame.
	JLabel mortgageLabel = new JLabel("MORTGAGE PAYMENT CALCULATOR",
	JLabel.CENTER);

	JPanel row2 = new JPanel(new GridLayout(1, 2));
	JLabel principalLabel = new JLabel("Mortgage Amount $", JLabel.LEFT);
	JTextField principalText = new JTextField(10);

	JPanel row3 = new JPanel (new GridLayout(1, 2));
	JLabel termLabel = new JLabel("Mortgage Term (Years)", JLabel.LEFT);
	JTextField termText = new JTextField(3);

	JPanel row4 = new JPanel(new GridLayout(1,2));
	JLabel intRateLabel = new JLabel("Interest Rate (%)", JLabel.LEFT);
	JTextField intRateText = new JTextField(5);

	JPanel row5 = new JPanel(new GridLayout(1,2));
	JLabel paymentLabel = new JLabel("Monthly Payment $", JLabel.LEFT);
	JTextField paymentText = new JTextField(10);

	JPanel row6 = new JPanel(new GridLayout (1, 4));
	JLabel payLabel = new JLabel("Payment", JLabel.LEFT);
	JLabel prinLabel = new JLabel("", JLabel.LEFT);//Left for spacing and future needs
	JLabel intLabel = new JLabel("Interest", JLabel.LEFT);
	JLabel balLabel = new JLabel("Balance", JLabel.LEFT);

	// Create buttons to calculate payment, clear payment field and exit program
	JPanel radioPanel = new JPanel();
	JRadioButton button7 = new JRadioButton("7 Years at 5.35%", false);
	JRadioButton button15 = new JRadioButton("15 Years at 5.50%", false);
	JRadioButton button30 = new JRadioButton("30 Years at 5.75%", false);

	JPanel button = new JPanel(new FlowLayout(FlowLayout.CENTER, 10, 10));
	JButton calculateButton = new JButton("CALCULATE");
	JButton clearButton = new JButton("CLEAR");
	JButton exitButton = new JButton("EXIT");

	JTextArea displayArea = new JTextArea(10, 30);
	JScrollPane scroll = new JScrollPane(displayArea);

	JTextArea graphArea = new JTextArea (10, 30);

	JButton graphButton = new JButton("DISPLAY GRAPH");

	//sets decimal format
	DecimalFormat dollarAmount = new DecimalFormat("0.00");
    DecimalFormat percentAmount = new DecimalFormat("##.##");

    DataInputStream istream;

	//constructor Builds and displays GUI
	public void frame1()
	{
		this.setTitle("Mortgage Calculator");
		setSize(450, 450);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container pane = getContentPane();
		getRates();

		Border rowboarder = new EtchedBorder();

		pane.add(row1);
		row1.add(mortgageLabel);
		row1.setMaximumSize(new Dimension (10000, row1.getMinimumSize().height));

		pane.add(row2);
		row2.add(principalLabel);
		row2.add(principalText);
		row2.setMaximumSize(new Dimension (10000, row2.getMinimumSize().height));
		principalText.setText("200000");

		pane.add(row3);
		row3.add(termLabel);
		row3.add(termText);
		row3.setMaximumSize(new Dimension (10000, row3.getMinimumSize().height));
		termText.setEditable(false);
		termText.setText("30");

		pane.add(row4);
		row4.add(intRateLabel);
		row4.add(intRateText);
		row4.setMaximumSize(new Dimension (10000, row4.getMinimumSize().height));
		intRateText.setEditable(false);
		intRateText.setText("5.75");

		// set Radio Buttons as group so only one can be selected
		ButtonGroup buttonGrp = new ButtonGroup();
		buttonGrp.add(button7);
		buttonGrp.add(button15);
		buttonGrp.add(button30);

		//add radio buttons to GUI
		radioPanel.add(button7);
		radioPanel.add(button15);
		radioPanel.add(button30);
		pane.add(radioPanel);
		radioPanel.setMaximumSize(new Dimension(10000,
		radioPanel.getMinimumSize().height));

		pane.add(row5);
		row5.add(paymentLabel);
		row5.add(paymentText);
		row5.setMaximumSize(new Dimension (10000, row5.getMinimumSize().height));
		paymentText.setEditable(false);

		// Add Buttons for calculate, clear, and exit
		button.add(calculateButton);
		button.add(clearButton);
		button.add(exitButton);
		pane.add(button);

		// Add Listeners to buttons
		calculateButton.addActionListener(this);
		clearButton.addActionListener(this);
		exitButton.addActionListener(this);
		button7.addActionListener(this);
		button15.addActionListener(this);
		button30.addActionListener(this);
		graphButton.addActionListener(this);

		//Add labels above text box (Amortization)
		pane.add(row6);
		row6.add(payLabel);
		row6.add(balLabel);
		row6.add(intLabel);
		row6.add(prinLabel);//added for spacing and future need
		row6.setMaximumSize(new Dimension (10000, row6.getMinimumSize().height));

		pane.add(row6);

		scroll.setBorder(BorderFactory.createEtchedBorder());

		pane.add(scroll);

		pane.add(graphButton);

		pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));
		setContentPane(pane);
		setVisible(true);

	}
	//Main method
	public static void main(String[] args)throws ParseException
	{
    	MortCal5 frame = new MortCal5();
    	frame.frame1();

    }

	//opens the rates.txt file and reads the interest rates into the array
	public void getRates()
	{
	    try
	    {
	      ArrayList<String> arrayRates = new ArrayList<String>();

	      BufferedReader inputfile = new BufferedReader(new FileReader("rates.txt"));
	      String data;

	      while ((data = inputfile.readLine()) != null)
	      {
	        System.out.println(data);
	        arrayRates.add(data);
	      }

	      rates = new double[arrayRates.size()];
	      for (int i = 0; i < rates.length; ++i)
	      {
	         rates[i] = Double.parseDouble(arrayRates.get(i));
	      }

	      inputfile.close();
	    }
	    catch(Exception ec)
	    {
	      JOptionPane.showMessageDialog(null,
	      "Could not find the file specified", "Error Message",
	      JOptionPane.ERROR_MESSAGE);
	    }
	  }

	//Verifies input for positive number and returns payment amount
	public void actionPerformed(ActionEvent event) {
		if (event.getSource() == button7)
		{
			years = 7;
			for (int i = 0; i < rates.length; ++i)
			{
				interest = rates[0];
	      	}
		}
		else if (event.getSource() == button15)
		{
			years = 15;
			for (int i = 0; i < rates.length; ++i)
			{
				interest = rates[1];
	      	}
		}
		else if (event.getSource() == button30)
		{
			years = 30;
			for (int i = 0; i < rates.length; ++i)
			{
				interest = rates[2];
	      	}
		}
			intRateText.setText(Double.toString(interest));
			termText.setText(Integer.toString(years));
	    	if (event.getSource() == calculateButton)
	   	{
			try
			{
				displayArea.setText(null);
				String principalTest = principalText.getText();
				principle = Double.parseDouble(principalTest);
			if (principle < 1)
			{
				throw new OutOfRangeException();
			}
			}
			catch (NumberFormatException e)
			{
				principalText.setText("Invalid Amount");
				JOptionPane.showMessageDialog(null, "Enter Positive Numbers Only ", "INVALD ENTRY", JOptionPane.ERROR_MESSAGE);
				return;
			}
			catch (OutOfRangeException e)
			{
				principalText.setText("Invalid Amount");
				JOptionPane.showMessageDialog(null, "Enter Positive Numbers Only ", "INVALD ENTRY", JOptionPane.ERROR_MESSAGE);
				return;
			}
				setResultValue();
	        }
	        //clears fields
		    if (event.getSource() == clearButton)
		    {
	        	principalText.setText("");
	        	termText.setText("");
	        	intRateText.setText("");
	        	paymentText.setText("");
	        	displayArea.setText(null);
	        }
	        if (event.getSource() == graphButton)
	        {
				JFrame f = new JFrame("Chart");
				f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
				f.getContentPane().add(new ChartPanel(values, names, "Principle/Interest"));
				f.setSize(400, 300);
				f.setLocation(300,300);
				f.setVisible(true);
				double principleP = 0.0;
				double interestP = 0.0;
				double[] values = new double[2];
				String[] names = new String[2];

				values[0] = principleP;
				names[0] = "Principle";

				values[1] = interestP;
				names[1] = "Interest";
				System.out.println(interestP);
				f.getContentPane().add(new ChartPanel(values, names, "Principle/Interest"));
    		}
			if (event.getSource() == exitButton)
			{
				System.exit(0);
			}
		}

	//Calculates mortgage payment, creates and displays amortization schedule
	public void setResultValue()
	 	{
	   		double amount = Double.parseDouble(principalText.getText());
	   		double term = Double.parseDouble(termText.getText());
	   		double rate = Double.parseDouble(intRateText.getText()) / 100.;
	   		double result = (amount * ( rate/12))/(1-( Math.pow (1/( 1 +(rate/12)), (term*12))));
		    paymentText.setText("" + dollarAmount.format(result));

		    double intPaid = 0;
		    double principalPaid = 0;
		    double balance = amount;
		    double monthlyRate = rate / 12;
		    double months = term * 12;


		    int payment = 1;

		    for (int y = 1; y <= term; y++)
		    {
				displayArea.append("");

			// Loop to to calculate and display the payment schedule
			for (int m = 0; m < 12; m++)
			{ /* start inner loop */
				intPaid = balance * monthlyRate;
				principalPaid = result - intPaid;
				balance = balance - principalPaid;

				displayArea.append("Month " + payment + "\t" + "   " +"   "
				+ dollarAmount.format(balance) + "\t" +"              "
				+ dollarAmount.format(intPaid) + "\n");
				payment++;
	    		displayArea.setCaretPosition(0);

	    		intTotal += intPaid;
				priTotal += principalPaid;
				payTotal += result;

				interestP = (intTotal)/(payTotal) * 100;
				principalP = (priTotal)/(payTotal) * 100;
			}

		}
			System.out.println(intTotal);//temporary to check results of total (will delete)
			System.out.println(priTotal);
	/*public double getinterestP()
			{
				interestP = (intTotal)/(payTotal) * 100;
				return interestP;
			}*/


				}

			}


//class to extend Exception to validate numbers for negative and 0 input
class OutOfRangeException extends Exception //Burd, B. (2007). Java for Dummies. Indianapolis, IN: Wiley Publishing, Inc..
{
}

class ChartPanel extends JPanel {

  private double[] values;
  private String[] names;
  private String title;



  public ChartPanel(double[] v, String[] n, String t)
  {
    names = n;
    values = v;
    title = t;
  }

  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);
    if (values == null || values.length == 0)
      return;
    double minValue = 0;
    double maxValue = 0;
    for (int i = 0; i < values.length; i++) {
      if (minValue > values[i])
        minValue = values[i];
      if (maxValue < values[i])
        maxValue = values[i];
  }

    Dimension d = getSize();
    int clientWidth = d.width;
    int clientHeight = d.height;
    int barWidth = clientWidth / values.length;

    Font titleFont = new Font("SansSerif", Font.BOLD, 20);
    FontMetrics titleFontMetrics = g.getFontMetrics(titleFont);
    Font labelFont = new Font("SansSerif", Font.PLAIN, 10);
    FontMetrics labelFontMetrics = g.getFontMetrics(labelFont);

    int titleWidth = titleFontMetrics.stringWidth(title);
    int y = titleFontMetrics.getAscent();
    int x = (clientWidth - titleWidth) / 2;
    g.setFont(titleFont);
    g.drawString(title, x, y);

    int top = titleFontMetrics.getHeight();
    int bottom = labelFontMetrics.getHeight();
    if (maxValue == minValue)
      return;
    double scale = (clientHeight - top - bottom) / (maxValue - minValue);
    y = clientHeight - labelFontMetrics.getDescent();
    g.setFont(labelFont);

    for (int i = 0; i < values.length; i++) {
      int valueX = i * barWidth + 1;
      int valueY = top;
      int height = (int) (values[i] * scale);
      if (values[i] >= 0)
        valueY += (int) ((maxValue - values[i]) * scale);
      else {
        valueY += (int) (maxValue * scale);
        height = -height;
      }

      g.setColor(Color.lightGray);
      g.fillRect(valueX, valueY, barWidth - 2, height);
      g.setColor(Color.black);
      g.drawRect(valueX, valueY, barWidth - 2, height);
      int labelWidth = labelFontMetrics.stringWidth(names[i]);
      x = i * barWidth + (barWidth - labelWidth) / 2;
      g.drawString(names[i], x, y);
    }
  }
}
Attachments
5.35
5.50
5.75

Holy moly that's a lot of code. How about you narrow it down and show us specifically where your problem is.

I wish I knew what my problem is! :( I need this

interestP = (intTotal)/(payTotal) * 100;
principalP = (priTotal)/(payTotal) * 100;

the interestP and the pricipalP to be used in the additional class to fill the chart, but they are not working. So my chart is empty.

I know this is a stupid question. I'm sorry I really am. But what is a call to the other class?

I have this

MortCal5 frame = new MortCal5();
    	frame.frame1();

in my main method

In the main method? I thought I had to have a separate class for the graph. I'm really not trying to be irritating. I'm not always so stupid so it frustrates me.

Separate class for the graph is OK.
This code
f.getContentPane().add(new ChartPanel(values, names, "Principle/Interest"));
is where you call your class to create the graph. You call it twice, and it looks like you only have data set up for the second call?
I suggest you add a some temporary print statements to the constructor of your graph class to display the values of the parameters that are passed. That way you can see if the problem is in the graph class, or in the way it's being called.

This article has been dead for over six months. Start a new discussion instead.