Help with display

Java Gui with display

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3 Replies - 905 Views - Last Post: 17 May 2008 - 09:51 AM Rate Topic:

#1 msnider9

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Posts: 4
Joined: 27-April 08

Help with display

Post icon Posted 15 May 2008 - 06:53 PM

code compiles but does not display please help

import java.awt.*;
import java.awt.event.*;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.font.*;
import java.awt.Font;
import java.awt.geom.*;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.Reader;
import java.text.MessageFormat;
import java.text.NumberFormat;
import java.io.FileReader;
import java.io.*;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;


public class Mortgage5 extends JFrame implements ActionListener
{
	 JLabel Llabel; //amount label
	 JTextField Ltextfield;//amount textfield
	 JLabel Olabel;//option label
	 JComboBox options;//option combobox
	 JLabel Tlabel;//term label
	 JTextField Ttextfield;//term textfield
	 JLabel Rlabel;//rate label
	 JTextField Rtextfield;//rate textfield
	 JLabel Plabel;  //payment label
	 JLabel $label;  //field for monthly payment amount
	 JButton calculate;  //calculate button
	 JButton reset;  //reset button
	 JButton end;  //end button
	 JTable table;//create table
	 JMenuItem mnuExit = new JMenuItem("Exit");
	 DefaultTableModel model;//table model
	 int[] trmArray;
	 double[] intrstArray;
	 JButton graph;
	 private float[]  yearlyPrinciple;
	 private float[]  yearlyInterest;

	 // header
	 public Mortgage5 ()
	 {
		  super("Mortgage Payment Calculator");
		  setDefaultLookAndFeelDecorated(true);
		  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		  load();
		  init();
		  pack();
		  setVisible(true);
	 }

	 //reading from sequential file
	 public void load()
	 {
		  Reader fis;
			   try
			   {

					fis = new FileReader("data.txt");

					BufferedReader b = new BufferedReader( fis );

					String[] line = b.readLine(  ).split(",");
					trmArray = new int[line.length];
					for ( int i = 0; i < line.length; i++ )
					{
						 trmArray[ i ] = Integer.parseInt(line[i].trim());
					}

					line = b.readLine(  ).split(",");
					intrstArray = new double[line.length];
					for ( int i = 0; i < line.length; i++ )
					{
						 intrstArray[ i ] = Double.parseDouble(line[i].trim());
					}

			   b.close();
			   fis.close();
			   }

			   catch ( Exception e1 )
			   {
					e1.printStackTrace(  );
			   }
	 }

	 //creates labels, buttons and textfields
	 public void init()
	 {
		  Mortgage5Layout customLayout = new Mortgage5Layout();

		  Container con = getContentPane();
		  con.setLayout(customLayout);

		  con.setFont(new Font("Arial", Font.PLAIN, 12));
		  con.setLayout(customLayout);

		  Llabel = new JLabel("Mortgage Loan Amount $ (no comma)");//amount label
		  con.add(Llabel);

		  Ltextfield = new JTextField("");//amount textfield
		  con.add(Ltextfield);

		  Olabel = new JLabel("Preset Term & Interest Rate %");//option label
		  con.add(Olabel);

		  options = new JComboBox();
		  con.add(options);

		  options.addItem(" (choose rate)");
		  options.addItem("7 years at 5.35%");
			  options.addItem("15 years at 5.5%");
			  options.addItem("30 years at 5.75%");
		  options.setEnabled(false);

		  {
				options.addItem("");
		  }

		  for (int i = 0; i < trmArray.length; i++)
		  {
			   options.addItem("");
		  }

		  Tlabel = new JLabel("Term (years)");//term label
		  con.add(Tlabel);

		  Ttextfield = new JTextField("");//term textfield
		  con.add(Ttextfield);

		  Rlabel = new JLabel("Interest Rate");//rate label
		  con.add(Rlabel);

		  Rtextfield = new JTextField("");//rate textfield
		  con.add(Rtextfield);

		  Plabel = new JLabel("Monthly Payment Amount");//payment label
		  con.add(Plabel);

		  $label = new JLabel("");//payment textfield
		  con.add($label);

		  calculate = new JButton("Calculate");//calculate button
		  con.add(calculate);
		  calculate.setBackground(Color.green);

		  reset = new JButton("Reset");//reset button
		  con.add(reset);
		  reset.setBackground(Color.yellow);

		  end = new JButton ("End");//end button
		  con.add(end);
		  end.setBackground(Color.red);

					//table header names
		  String[] columnNames = {"Payment #","Payment Amount", "Interest", "Principle Reduction",
											 "Remaining Balance"};

		  //create table and table model
		  model = new DefaultTableModel(columnNames, 0);
		  table = new JTable(model);
		  JScrollPane scroll = new JScrollPane(table);
		  table.setPreferredScrollableViewportSize(new Dimension (10, 600));
		  con.add (scroll);

		  graph = new JButton ("Display Graph");//Display Graph button
		  con.add(graph);
		  graph.setBackground(Color.blue);

		  //action listeners
		  Ltextfield.addActionListener(this); //loanfield
		  options.addActionListener(this); //interestfield
		  calculate.addActionListener(this);  //calButtion
		  reset.addActionListener(this); //resetButton
		  end.addActionListener(this);  //endButton
		  graph.addActionListener(this);  //graphButton
	 }


	 //action event from listeners
	 public void actionPerformed(ActionEvent event)
	 {
	 Object source = event.getSource();
		  if (source == calculate)
		  {
			   startCalculations();
		  }

		  if (source == reset)
		  {
			   reset();
		  }

		  if (source==options)
		  {
			   setRate();
		  }

		  if (source == end)
		  {
			   exit();
		  }

		  if (source == mnuExit)
		  {
			exitGraph();
		   }
		  if (source == graph)
		  {
			   mFrame = new JFrame("Mortgage Graph");
			   mFrame.getContentPane().add(new GraphPanel(yearlyPrinciple, yearlyInterest));
			   mFrame.setSize(800,600);
			   mFrame.setLocation(200,100);

			 //trying to create menu
			 // Create an instance of the menu (Creates the Menu Bar)
				 JMenuBar mnuBar = new JMenuBar();
					 mFrame.setJMenuBar(mnuBar);

			 // Construct and populate the Exit menu (Creates the Exit Menu)
				 JMenu mnuExitbar = new JMenu ("End", true);
					  mnuBar.add(mnuExitbar);
					mnuExitbar.add(mnuExit);

		mFrame.setVisible(true);

			   //exit listener
				mnuExit.addActionListener(this);  //exitButton
		  }
		}
		  public JFrame mFrame = new JFrame();


void exitGraph()
{

			 mFrame.dispose();
			 mFrame = null;
		  }

		  void setRate()
	 {
		  int index = options.getSelectedIndex();

		  //term and interest error check
		  if (index > 0)
		  {
			   try
			   {
					Ttextfield.setText(Integer.toString(trmArray[index-1]));
			   }

			   catch (NumberFormatException e)
			   {
					JOptionPane.showMessageDialog(null, "Invalid or missing Loan Term.  Please try again!",
															"Message Dialog", JOptionPane.PLAIN_MESSAGE);
					Ttextfield.setText(null);
			   }

			   try
			   {
					Rtextfield.setText(Double.toString(intrstArray[index-1]));
			   }

			   catch (NumberFormatException e)
			   {
					JOptionPane.showMessageDialog(null, "Invalid or missing Interest Rate.  Please try again!",
													   "Message Dialog", JOptionPane.PLAIN_MESSAGE);
					Rtextfield.setText(null);
			   }
		  }
	 }

	 //calculation section
	 void startCalculations()
	 {
		  Thread thisThread = Thread.currentThread();
		  NumberFormat currency = NumberFormat.getCurrencyInstance();

		  double amt = 0;
		  double trm = 0;
		  double intrst = 0;
		  double moIn = 0;
		  double moTrm = 0;
		  double prin = 0;
		  double paymt = 0;

		  //amount error check
		  try
		  {
			   amt = Double.parseDouble(Ltextfield.getText());
		  }

		  catch (NumberFormatException e)
		  {
			   JOptionPane.showMessageDialog(null, "Missing Amount or Use of Commas",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Ltextfield.setText(null);
			   Ttextfield.setText(null);
			   Rtextfield.setText(null);
			   options.setSelectedIndex(0);
		  }

		  //term and interest error check
		  try
		  {
			   trm = Double.parseDouble(Ttextfield.getText());

		  }

		  catch (NumberFormatException e)
		  {
			   JOptionPane.showMessageDialog(null, "Invalid or missing Loan Term.  Please try again!",
												  "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Ttextfield.setText(null);
		  }

		  try
		  {
			   intrst = Double.parseDouble(Rtextfield.getText());
		  }

		  catch (NumberFormatException e)
		  {
			   JOptionPane.showMessageDialog(null, "Invalid or missing Interest Rate.  Please try again!",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Rtextfield.setText(null);
		  }

		  if (amt > 0)
		  {
			   amt = Double.parseDouble(Ltextfield.getText());
			   moIn = (intrst / 1200);//monthly interest rate
			   moTrm = trm * 12;//number of payments
			   paymt = (amt * moIn) / (1-Math.pow((1+moIn), -moTrm));//amount forumla
				  yearlyPrinciple = new float[(int)trm]; // initialize the arrays to store yearly principle and interest
				  yearlyInterest = new float[(int)trm];

			   $label.setText("" + currency.format(paymt));

			   double newPrin = amt;

			   for (int i = 0; i < trm; i++)
			   {
					   yearlyInterest[i] = 0.0f; //start at 0.0
						 yearlyPrinciple[i] = 0.0f; //start at 0.0
					   for(int j = 1; j <=12; j++)
						 {
					double newIn = moIn * newPrin;//monthly interest amount
					double reduct = paymt - newIn;//monthly principle
						 yearlyInterest[i] += newIn; // accumalate the interest
						 yearlyPrinciple[i] += reduct; //accumalate the principle
						 newPrin = newPrin - reduct;//balance

					//stops showing negative balance
					if (newPrin < 0)
						 newPrin = 0;
					else
						 newPrin = newPrin;

					//inserts different amounts into the table
					model.addRow(new Object[] { Integer.toString((i*12) + j), currency.format(paymt),
					currency.format(newIn), currency.format(reduct), currency.format(newPrin) });
						 }
						 //for testing purposes only
//						 model.addRow(new Object[] { Integer.toString(i), currency.format(0.0),
//					currency.format(yearlyInterest[i]), currency.format(yearlyPrinciple[i]), currency.format(0.0) });
			   }
		  }

		  //less than 0 error check
		  if (amt < 0)
		  {
			   JOptionPane.showMessageDialog(null, "Please Enter Positie Numbers Only.",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Ltextfield.setText(null);
		  }

	 }

	 //resets all fields
	 void reset()
	 {
		  Ltextfield.setText(null);
		  Ttextfield.setText(null);
		  Rtextfield.setText(null);
		  options.setSelectedIndex(0);
		  $label.setText(null);
		  model.setRowCount(0);
	 }

	 //exit the program with thank you message
	 void exit()
	 {
		  JOptionPane.showMessageDialog(null, "		  Thank you for using \n Mortgage Calculator",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);

		  System.exit(0);
	 }

	 public static void main(String args[])
	 {
		  java.awt.EventQueue.invokeLater(new Runnable()
		  {
			   public void run()
			   {
					new Mortgage5().setVisible(true);
			   }
		  });
	 }
}

//creates class for container layout and placement
class Mortgage5Layout implements LayoutManager{
	 public Mortgage5Layout() {}

	 public void addLayoutComponent(String name, Component comp) {}

	 public void removeLayoutComponent(Component comp) {}

	 public Dimension preferredLayoutSize(Container parent)
	 {
		  Dimension dim = new Dimension(0, 0);
		  Insets insets = parent.getInsets();
		  dim.width = 600 + insets.left + insets.right;
		  dim.height = 425 + insets.top + insets.bottom;

		  return dim;
	 }

	 public Dimension minimumLayoutSize(Container parent)
	 {
		  Dimension dim = new Dimension(0, 0);

		  return dim;
	 }

	 public void layoutContainer(Container parent)
	 {
		  Insets insets = parent.getInsets();

		  Component c;
		  c = parent.getComponent(0);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+8,250,24);}
		  c = parent.getComponent(1);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+8,175,24);}
		  c = parent.getComponent(2);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+40,250,24);}
		  c = parent.getComponent(3);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+40,150,24);}
		  c = parent.getComponent(4);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+72,250,24);}
		  c = parent.getComponent(5);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+72,96,24);}
		  c = parent.getComponent(6);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+104,250,24);}
		  c = parent.getComponent(7);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+104,112,24);}
		  c = parent.getComponent(8);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+136,250,24);}
		  c = parent.getComponent(9);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+136,112,24);}
		  c = parent.getComponent(10);
			   if (c.isVisible()) {c.setBounds(insets.left+50,insets.top+168,96,24);}
		  c = parent.getComponent(11);
			   if (c.isVisible()) {c.setBounds(insets.left+225,insets.top+168,112,24);}
		  c = parent.getComponent(12);
			   if (c.isVisible()) {c.setBounds(insets.left+400,insets.top+168,96,24);}
		  c = parent.getComponent(13);
		  if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+200,575,160);}
		  c = parent.getComponent(14);
		  if (c.isVisible()) {c.setBounds(insets.left+225,insets.top+375,112,24);}
	 }
}

class GraphPanel extends JPanel
{
	final int
		HPAD = 60,
		VPAD = 40;
	int[] data;
	Font font;
	 float[] principleData;
	 float[] interestData;


	public GraphPanel(float[] p, float[] i)
	{

	 principleData = p;
	 interestData = i;

		font = new Font("lucida sans regular", Font.PLAIN, 16);
		setBackground(Color.white);
	}

	protected void paintComponent(Graphics g)
	{
		super.paintComponent(g);

		Graphics2D g2 = (Graphics2D)g;
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
							RenderingHints.VALUE_ANTIALIAS_ON);
		g2.setFont(font);
		FontRenderContext frc = g2.getFontRenderContext();
		int w = getWidth();
		int h = getHeight();
		// scales
		float xInc = (w - HPAD - VPAD) / (interestData.length - 1);//11f;  //distance between each plot
		float yInc = (h - 2*VPAD) / 10f;
		int[] dataVals = getDataVals();		//min and max values for y-axis
		float yScale = dataVals[2] / 10f;

		// ordinate (y - axis)
		g2.draw(new Line2D.Double(HPAD, VPAD, HPAD, h - VPAD));
		// plot tic marks
		float x1 = HPAD, y1 = VPAD, x2 = HPAD - 3, y2;
		for(int j = 0; j < 10; j++)
		{
			g2.draw(new Line2D.Double(x1, y1, x2, y1));
			y1 += yInc;
		}
		// labels
		String text; LineMetrics lm;
		float xs, ys, textWidth, height;
		for(int j = 0; j <= 10; j++)
		{
			text = String.valueOf(dataVals[1] - (int)(j * yScale));
			textWidth = (float)font.getStringBounds(text, frc).getWidth();
			lm = font.getLineMetrics(text, frc);
			height = lm.getAscent();
			xs = HPAD - textWidth - 7;
			ys = VPAD + (j * yInc) + height/2;
			g2.drawString(text, xs, ys);
		}

		// abcissa (x - axis)
		g2.draw(new Line2D.Double(HPAD, h - VPAD, w - VPAD, h - VPAD));
		// tic marks
		x1 = HPAD; y1 = h - VPAD; y2 = y1 + 3;
		for(int j = 0; j < interestData.length; j++)
		{
			g2.draw(new Line2D.Double(x1, y1, x1, y2));
			x1 += xInc;
		}
		// labels
		ys = h - VPAD;
		for(int j = 0; j < interestData.length; j++)
		{
			text = String.valueOf(j + 1);
			textWidth = (float)font.getStringBounds(text, frc).getWidth();
			lm = font.getLineMetrics(text, frc);
			height = lm.getHeight();
			xs = HPAD + j * xInc - textWidth/2;
			g2.drawString(text, xs, ys + height);
		}

		// plot data
		  float yy2 = 0, yy1 = 0, xx2 = 0, xx1;
		x1 = HPAD;
		  xx1 = HPAD;
		yScale = (float)(h - 2*VPAD) / dataVals[2];

		for(int j = 0; j < interestData.length; j++)
		{
		  g.setColor(Color.blue);
		  y1 = VPAD + (h - 2*VPAD) - (principleData[j] - dataVals[0]) * yScale;

			if(j > 0)
			g2.draw(new Line2D.Double(x1, y1, x2, y2));
			x2 = x1;
			y2 = y1;
			x1 += xInc;

		  g.setColor(Color.red);
		  yy1 = VPAD + (h - 2*VPAD) - (interestData[j] - dataVals[0]) * yScale;
			   if(j > 0)
			g2.draw(new Line2D.Double(xx1, yy1, xx2, yy2));
			xx2 = xx1;
			yy2 = yy1;
			xx1 += xInc;

		}
	}

	private int[] getDataVals()
	{
		int max = Integer.MIN_VALUE;
		int min = Integer.MAX_VALUE;
		  int j = interestData.length -1;
		  max = (int)principleData[j];
		  min = (int)interestData[j];
		int span = max - min;
		return new int[] { min, max, span };
	}
}

Is This A Good Question/Topic? 0

Replies To: Help with display

#2 pbl

There is nothing you can't do with a JTable

Reputation: 8066

Posts: 31,310
Joined: 06-March 08

Re: Help with display

Posted 15 May 2008 - 09:44 PM

msnider9, on 15 May, 2008 - 06:53 PM, said:

code compiles but does not display please help

Add a few System.out.println() in your load() method.

I thing you have problem reading your data.txt file.

As I don't have a copy of your data.txt file I did the following modification to your code:
It was a guess....

	 int[] trmArray = {1000, 5000, 10000};
	 double[] intrstArray = {5.0, 10.0, 15.0};

	 //reading from sequential file
	 public void load()
	 {
					  return;
	 }

It works like a charm... calculating with I don't know which interest rate
The graph is well displayed

no way to select the interest rate thought... the comboBox is not enabled but setRate() used trmRate[0]

		options.addItem(" (choose rate)");
		options.addItem("7 years at 5.35%");
		options.addItem("15 years at 5.5%");
		options.addItem("30 years at 5.75%");
		options.setEnabled(false);

		for (int i = 0; i < trmArray.length; i++)
		{
			options.addItem("");
		}

This seems weird... I gues you try to read years and interest from the file
If you read from the file why do you add hardcoded values ?
So what do you add "" for as many times you have a trmArray ?

Was This Post Helpful? 0

#3 msnider9

New D.I.C Head

Reputation: 0

Posts: 4
Joined: 27-April 08

Re: Help with display

Posted 17 May 2008 - 01:14 AM

Still having a few issues. The menu choices are not working. What did I do wrong with them? I still do not think it is reading the rates.txt file so need to know what to change with it. Also I am getting a blank gui frame How do I get rid of it. Thanks for your help

import java.awt.*;
import java.awt.event.*;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.font.*;
import java.awt.Font;
import java.awt.geom.*;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.Reader;
import java.text.MessageFormat;
import java.text.NumberFormat;
import java.io.FileReader;
import java.io.*;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;


public class Mortgage5 extends JFrame implements ActionListener
{
	 JLabel Llabel; //amount label
	 JTextField Ltextfield;//amount textfield
	 JLabel Olabel;//option label
	 JComboBox options;//option combobox
	 JLabel Tlabel;//term label
	 JTextField Ttextfield;//term textfield
	 JLabel Rlabel;//rate label
	 JTextField Rtextfield;//rate textfield
	 JLabel Plabel;  //payment label
	 JLabel $label;  //field for monthly payment amount
	 JButton calculate;  //calculate button
	 JButton reset;  //reset button
	 JButton end;  //end button
	 JTable table;//create table
	 JMenuItem mnuExit = new JMenuItem("Exit");
	 DefaultTableModel model;//table model
	 int[] trmArray = {7,15,30};
	 double[] intrstArray = {5.35,5.5,5.75};
	 JButton graph;
	 private float[]  yearlyPrinciple;
	 private float[]  yearlyInterest;

	 // header
	 public Mortgage5()
	 {
		  super("Mortgage Payment Calculator");
		  setDefaultLookAndFeelDecorated(true);
		  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		  load();
		  init();
		  pack();
		  setVisible(true);

 
		  // create a instance of a menu
		MenuBar mnuMyBar = new MenuBar();
		setMenuBar(mnuMyBar);


		// constructs File menu and populates
		Menu mnuMyFile = new Menu("File",true);
		mnuMyBar.add(mnuMyFile);
			MenuItem mnuMyFileExit = new MenuItem("Exit");
			mnuMyFile.add(mnuMyFileExit);

		// constructs File menu and populates
		Menu mnuAvailLoans = new Menu("Available Loans", true);
		mnuMyBar.add(mnuAvailLoans);
			MenuItem mnuAvailLoans1 = new MenuItem("5.35% Interest at 7 Years");
			mnuAvailLoans.add(mnuAvailLoans1);
			MenuItem mnuAvailLoans2 = new MenuItem("5.50% Interest at 15 Years");
			mnuAvailLoans.add(mnuAvailLoans2);
			MenuItem mnuAvailLoans3 = new MenuItem("5.75% Interest at 30 Years");
			mnuAvailLoans.add(mnuAvailLoans3);

		// add ActionListener to menu items
		mnuMyFileExit.addActionListener(this);
		mnuAvailLoans1.addActionListener(this);
		mnuAvailLoans2.addActionListener(this);
		mnuAvailLoans3.addActionListener(this);

		// add ActionCommand to menu items
		mnuMyFileExit.setActionCommand("Exit");
		mnuAvailLoans1.setActionCommand("Loans1");
		mnuAvailLoans2.setActionCommand("Loans2");
		mnuAvailLoans3.setActionCommand("Loans3");

			   mFrame.setVisible(true);

			   //exit listener
				mnuExit.addActionListener(this);  //exitButton

	 }

	 //reading from sequential file
	 public void load()
	 {
					  return;
	 }

		  Reader fis;
		  {
			try
			   {

					fis = new FileReader("rates.txt");

					BufferedReader b = new BufferedReader( fis );

					String[] line = b.readLine(  ).split(",");
					trmArray = new int[line.length];
					for ( int i = 0; i < line.length; i++ )
					{
						 trmArray[ i ] = Integer.parseInt(line[i].trim());
					}

					line = b.readLine(  ).split(",");
					intrstArray = new double[line.length];
					for ( int i = 0; i < line.length; i++ )
					{
						 intrstArray[ i ] = Double.parseDouble(line[i].trim());
					}

			   b.close();
			   fis.close();
			   }

			   catch ( Exception e1 )
			   {
					e1.printStackTrace(  );
			   }
	 }

	 //creates labels, buttons and textfields
	 public void init()
	 {
		  MortgageLayout customLayout = new MortgageLayout();

		  Container con = getContentPane();
		  con.setLayout(customLayout);

		  con.setFont(new Font("Arial", Font.PLAIN, 12));
		  con.setLayout(customLayout);

		  Llabel = new JLabel("Mortgage Loan Amount $ (no comma)");//amount label
		  con.add(Llabel);

		  Ltextfield = new JTextField("");//amount textfield
		  con.add(Ltextfield);

		  Olabel = new JLabel("Preset Term & Interest Rate %");//option label
		  con.add(Olabel);

		  options = new JComboBox();
		  con.add(options);

		  options.addItem(" (choose rate)");
		  options.addItem("7 years at 5.35%");
			  options.addItem("15 years at 5.5%");
			  options.addItem("30 years at 5.75%");
		  options.setEnabled(false);

		  {
				options.addItem("");
		  }

		  for (int i = 0; i < trmArray.length; i++)
		  {
			   options.addItem("");
		  }

		  Tlabel = new JLabel("Term (years)");//term label
		  con.add(Tlabel);

		  Ttextfield = new JTextField("");//term textfield
		  con.add(Ttextfield);

		  Rlabel = new JLabel("Interest Rate");//rate label
		  con.add(Rlabel);

		  Rtextfield = new JTextField("");//rate textfield
		  con.add(Rtextfield);

		  Plabel = new JLabel("Monthly Payment Amount");//payment label
		  con.add(Plabel);

		  $label = new JLabel("");//payment textfield
		  con.add($label);

		  calculate = new JButton("Calculate");//calculate button
		  con.add(calculate);
		  calculate.setBackground(Color.green);

		  reset = new JButton("Reset");//reset button
		  con.add(reset);
		  reset.setBackground(Color.yellow);

		  end = new JButton ("End");//end button
		  con.add(end);
		  end.setBackground(Color.red);

					//table header names
		  String[] columnNames = {"Payment #","Payment Amount", "Interest", "Principle Reduction",
											 "Remaining Balance"};

		  //create table and table model
		  model = new DefaultTableModel(columnNames, 0);
		  table = new JTable(model);
		  JScrollPane scroll = new JScrollPane(table);
		  table.setPreferredScrollableViewportSize(new Dimension (10, 600));
		  con.add (scroll);

		  graph = new JButton ("Display Graph");//Display Graph button
		  con.add(graph);
		  graph.setBackground(Color.blue);

		  //action listeners
		  Ltextfield.addActionListener(this); //loanfield
		  options.addActionListener(this); //interestfield
		  calculate.addActionListener(this);  //calButtion
		  reset.addActionListener(this); //resetButton
		  end.addActionListener(this);  //endButton
		  graph.addActionListener(this);  //graphButton
	 }


	 //action event from listeners
	 public void actionPerformed(ActionEvent event)
	 {
	 Object source = event.getSource();
		  if (source == calculate)
		  {
			   startCalculations();
		  }

		  if (source == reset)
		  {
			   reset();
		  }

		  if (source==options)
		  {
			   setRate();
		  }

		  if (source == end)
		  {
			   exit();
		  }

		  if (source == mnuExit)
		  {
			exitGraph();
		   }
		  if (source == graph)
		  {
			   mFrame = new JFrame("Mortgage Graph");
			   mFrame.getContentPane().add(new GraphP(yearlyPrinciple, yearlyInterest));
			   mFrame.setSize(800,600);
			   mFrame.setLocation(200,100);

			 // create a instance of a menu
		MenuBar mnuMyBar = new MenuBar();
		setMenuBar(mnuMyBar);


		// constructs File menu and populates
		Menu mnuMyFile = new Menu("File",true);
		mnuMyBar.add(mnuMyFile);
			MenuItem mnuMyFileExit = new MenuItem("Exit");
			mnuMyFile.add(mnuMyFileExit);

		// constructs File menu and populates
		Menu mnuAvailLoans = new Menu("Available Loans", true);
		mnuMyBar.add(mnuAvailLoans);
			MenuItem mnuAvailLoans1 = new MenuItem("5.35% Interest at 7 Years");
			mnuAvailLoans.add(mnuAvailLoans1);
			MenuItem mnuAvailLoans2 = new MenuItem("5.50% Interest at 15 Years");
			mnuAvailLoans.add(mnuAvailLoans2);
			MenuItem mnuAvailLoans3 = new MenuItem("5.75% Interest at 30 Years");
			mnuAvailLoans.add(mnuAvailLoans3);

		// add ActionListener to menu items
		mnuMyFileExit.addActionListener(this);
		mnuAvailLoans1.addActionListener(this);
		mnuAvailLoans2.addActionListener(this);
		mnuAvailLoans3.addActionListener(this);

		// add ActionCommand to menu items
		mnuMyFileExit.setActionCommand("Exit");
		mnuAvailLoans1.setActionCommand("Loans1");
		mnuAvailLoans2.setActionCommand("Loans2");
		mnuAvailLoans3.setActionCommand("Loans3");

			   mFrame.setVisible(true);

			   //exit listener
				mnuExit.addActionListener(this);  //exitButton
		  }
		}
		  public JFrame mFrame = new JFrame();


void exitGraph()
{

			 mFrame.dispose();
			 mFrame = null;
		  }

		  void setRate()
	 {
		  int index = options.getSelectedIndex();

		  //term and interest error check
		  if (index > 0)
		  {
			   try
			   {
					Ttextfield.setText(Integer.toString(trmArray[index-1]));
			   }

			   catch (NumberFormatException e)
			   {
					JOptionPane.showMessageDialog(null, "Invalid or missing Loan Term.  Please try again!",
															"Message Dialog", JOptionPane.PLAIN_MESSAGE);
					Ttextfield.setText(null);
			   }

			   try
			   {
					Rtextfield.setText(Double.toString(intrstArray[index-1]));
			   }

			   catch (NumberFormatException e)
			   {
					JOptionPane.showMessageDialog(null, "Invalid or missing Interest Rate.  Please try again!",
													   "Message Dialog", JOptionPane.PLAIN_MESSAGE);
					Rtextfield.setText(null);
			   }
		  }
	 }

	 //calculation section
	 void startCalculations()
	 {
		  Thread thisThread = Thread.currentThread();
		  NumberFormat currency = NumberFormat.getCurrencyInstance();

		  double amt = 0;
		  double trm = 0;
		  double intrst = 0;
		  double moIn = 0;
		  double moTrm = 0;
		  double prin = 0;
		  double paymt = 0;

		  //amount error check
		  try
		  {
			   amt = Double.parseDouble(Ltextfield.getText());
		  }

		  catch (NumberFormatException e)
		  {
			   JOptionPane.showMessageDialog(null, "Missing Amount or Use of Commas",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Ltextfield.setText(null);
			   Ttextfield.setText(null);
			   Rtextfield.setText(null);
			   options.setSelectedIndex(0);
		  }

		  //term and interest error check
		  try
		  {
			   trm = Double.parseDouble(Ttextfield.getText());

		  }

		  catch (NumberFormatException e)
		  {
			   JOptionPane.showMessageDialog(null, "Invalid or missing Loan Term.  Please try again!",
												  "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Ttextfield.setText(null);
		  }

		  try
		  {
			   intrst = Double.parseDouble(Rtextfield.getText());
		  }

		  catch (NumberFormatException e)
		  {
			   JOptionPane.showMessageDialog(null, "Invalid or missing Interest Rate.  Please try again!",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Rtextfield.setText(null);
		  }

		  if (amt > 0)
		  {
			   amt = Double.parseDouble(Ltextfield.getText());
			   moIn = (intrst / 1200);//monthly interest rate
			   moTrm = trm * 12;//number of payments
			   paymt = (amt * moIn) / (1-Math.pow((1+moIn), -moTrm));//amount forumla
				  yearlyPrinciple = new float[(int)trm]; // initialize the arrays to store yearly principle and interest
				  yearlyInterest = new float[(int)trm];

			   $label.setText("" + currency.format(paymt));

			   double newPrin = amt;

			   for (int i = 0; i < trm; i++)
			   {
					   yearlyInterest[i] = 0.0f; //start at 0.0
						 yearlyPrinciple[i] = 0.0f; //start at 0.0
					   for(int j = 1; j <=12; j++)
						 {
					double newIn = moIn * newPrin;//monthly interest amount
					double reduct = paymt - newIn;//monthly principle
						 yearlyInterest[i] += newIn; // accumalate the interest
						 yearlyPrinciple[i] += reduct; //accumalate the principle
						 newPrin = newPrin - reduct;//balance

					//stops showing negative balance
					if (newPrin < 0)
						 newPrin = 0;
					else
						 newPrin = newPrin;

					//inserts different amounts into the table
					model.addRow(new Object[] { Integer.toString((i*12) + j), currency.format(paymt),
					currency.format(newIn), currency.format(reduct), currency.format(newPrin) });
						 }
						 //for testing purposes only
//						 model.addRow(new Object[] { Integer.toString(i), currency.format(0.0),
//					currency.format(yearlyInterest[i]), currency.format(yearlyPrinciple[i]), currency.format(0.0) });
			   }
		  }

		  //less than 0 error check
		  if (amt < 0)
		  {
			   JOptionPane.showMessageDialog(null, "Please Enter Positive Numbers Only.",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);
			   Ltextfield.setText(null);
		  }

	 }

	 //resets all fields
	 void reset()
	 {
		  Ltextfield.setText(null);
		  Ttextfield.setText(null);
		  Rtextfield.setText(null);
		  options.setSelectedIndex(0);
		  $label.setText(null);
		  model.setRowCount(0);
	 }

	 //exit the program with thank you message
	 void exit()
	 {
		  JOptionPane.showMessageDialog(null, "		  Thank you for using \n Mortgage Calculator",
											 "Message Dialog", JOptionPane.PLAIN_MESSAGE);

		  System.exit(0);
	 }

	 public static void main(String args[])
	 {
	   
		  EventQueue.invokeLater(new Runnable()
		  {
			   public void run()
			   {

				  new Mortgage5().setVisible(true);
			   }
		  });
	 }
}

//creates class for container layout and placement
class MortgageLayout implements LayoutManager{
	 public MortgageLayout() {}
	 
	 public void addLayoutComponent(String name, Component comp) {}

	 public void removeLayoutComponent(Component comp) {}

	 public Dimension preferredLayoutSize(Container parent)
	 {
		  Dimension dim = new Dimension(0, 0);
		  Insets insets = parent.getInsets();
		  dim.width = 600 + insets.left + insets.right;
		  dim.height = 425 + insets.top + insets.bottom;

		  return dim;
	 }

	 public Dimension minimumLayoutSize(Container parent)
	 {
		  Dimension dim = new Dimension(0, 0);

		  return dim;
	 }

	 public void layoutContainer(Container parent)
	 {
		  Insets insets = parent.getInsets();

		  Component c;
		  c = parent.getComponent(0);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+8,250,24);}
		  c = parent.getComponent(1);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+8,175,24);}
		  c = parent.getComponent(2);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+40,250,24);}
		  c = parent.getComponent(3);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+40,150,24);}
		  c = parent.getComponent(4);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+72,250,24);}
		  c = parent.getComponent(5);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+72,96,24);}
		  c = parent.getComponent(6);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+104,250,24);}
		  c = parent.getComponent(7);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+104,112,24);}
		  c = parent.getComponent(8);
			   if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+136,250,24);}
		  c = parent.getComponent(9);
			   if (c.isVisible()) {c.setBounds(insets.left+300,insets.top+136,112,24);}
		  c = parent.getComponent(10);
			   if (c.isVisible()) {c.setBounds(insets.left+50,insets.top+168,96,24);}
		  c = parent.getComponent(11);
			   if (c.isVisible()) {c.setBounds(insets.left+225,insets.top+168,112,24);}
		  c = parent.getComponent(12);
			   if (c.isVisible()) {c.setBounds(insets.left+400,insets.top+168,96,24);}
		  c = parent.getComponent(13);
		  if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+200,575,160);}
		  c = parent.getComponent(14);
		  if (c.isVisible()) {c.setBounds(insets.left+225,insets.top+375,112,24);}
	 }
}

class GraphP extends JPanel
{
	final int
		HPAD = 60,
		VPAD = 40;
	int[] data;
	Font font;
	 float[] principleData;
	 float[] interestData;


	public GraphP(float[] p, float[] i)
	{

	 principleData = p;
	 interestData = i;

		font = new Font("lucida sans regular", Font.PLAIN, 16);
		setBackground(Color.white);
	}

	protected void paintComponent(Graphics g)
	{
		super.paintComponent(g);

		Graphics2D g2 = (Graphics2D)g;
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
							RenderingHints.VALUE_ANTIALIAS_ON);
		g2.setFont(font);
		FontRenderContext frc = g2.getFontRenderContext();
		int w = getWidth();
		int h = getHeight();
		// scales
		float xInc = (w - HPAD - VPAD) / (interestData.length - 1);//11f;  //distance between each plot
		float yInc = (h - 2*VPAD) / 10f;
		int[] dataVals = getDataVals();		//min and max values for y-axis
		float yScale = dataVals[2] / 10f;

		// ordinate (y - axis)
		g2.draw(new Line2D.Double(HPAD, VPAD, HPAD, h - VPAD));
		// plot tic marks
		float x1 = HPAD, y1 = VPAD, x2 = HPAD - 3, y2;
		for(int j = 0; j < 10; j++)
		{
			g2.draw(new Line2D.Double(x1, y1, x2, y1));
			y1 += yInc;
		}
		// labels
		String text; LineMetrics lm;
		float xs, ys, textWidth, height;
		for(int j = 0; j <= 10; j++)
		{
			text = String.valueOf(dataVals[1] - (int)(j * yScale));
			textWidth = (float)font.getStringBounds(text, frc).getWidth();
			lm = font.getLineMetrics(text, frc);
			height = lm.getAscent();
			xs = HPAD - textWidth - 7;
			ys = VPAD + (j * yInc) + height/2;
			g2.drawString(text, xs, ys);
		}

		// abcissa (x - axis)
		g2.draw(new Line2D.Double(HPAD, h - VPAD, w - VPAD, h - VPAD));
		// tic marks
		x1 = HPAD; y1 = h - VPAD; y2 = y1 + 3;
		for(int j = 0; j < interestData.length; j++)
		{
			g2.draw(new Line2D.Double(x1, y1, x1, y2));
			x1 += xInc;
		}
		// labels
		ys = h - VPAD;
		for(int j = 0; j < interestData.length; j++)
		{
			text = String.valueOf(j + 1);
			textWidth = (float)font.getStringBounds(text, frc).getWidth();
			lm = font.getLineMetrics(text, frc);
			height = lm.getHeight();
			xs = HPAD + j * xInc - textWidth/2;
			g2.drawString(text, xs, ys + height);
		}

		// plot data
		  float yy2 = 0, yy1 = 0, xx2 = 0, xx1;
		x1 = HPAD;
		  xx1 = HPAD;
		yScale = (float)(h - 2*VPAD) / dataVals[2];

		for(int j = 0; j < interestData.length; j++)
		{
		  g.setColor(Color.blue);
		  y1 = VPAD + (h - 2*VPAD) - (principleData[j] - dataVals[0]) * yScale;

			if(j > 0)
			g2.draw(new Line2D.Double(x1, y1, x2, y2));
			x2 = x1;
			y2 = y1;
			x1 += xInc;

		  g.setColor(Color.red);
		  yy1 = VPAD + (h - 2*VPAD) - (interestData[j] - dataVals[0]) * yScale;
			   if(j > 0)
			g2.draw(new Line2D.Double(xx1, yy1, xx2, yy2));
			xx2 = xx1;
			yy2 = yy1;
			xx1 += xInc;

		}
	}

	private int[] getDataVals()
	{
		int max = Integer.MIN_VALUE;
		int min = Integer.MAX_VALUE;
		  int j = interestData.length -1;
		  max = (int)principleData[j];
		  min = (int)interestData[j];
		int span = max - min;
		return new int[] { min, max, span };
	}
}

Are the listeners correct for the menu options?
Here is the rates.txt sequential file
7,5.35
15,5.5
30,5.75

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#4 pbl

There is nothing you can't do with a JTable

Reputation: 8066

Posts: 31,310
Joined: 06-March 08

Re: Help with display

Posted 17 May 2008 - 09:51 AM

msnider9, on 17 May, 2008 - 01:14 AM, said:

]
Still having a few issues. The menu choices are not working. What did I do wrong with them? I still do not think it is reading the rates.txt file so need to know what to change with it. Also I am getting a blank gui frame How do I get rid of it. Thanks for your help

Listener not correct for the menu:

		// add ActionListener to menu items
		mnuMyFileExit.addActionListener(this);
		mnuAvailLoans1.addActionListener(this);
		mnuAvailLoans2.addActionListener(this);
		mnuAvailLoans3.addActionListener(this);

		// add ActionCommand to menu items
		mnuMyFileExit.setActionCommand("Exit");
		mnuAvailLoans1.setActionCommand("Loans1");
		mnuAvailLoans2.setActionCommand("Loans2");
		mnuAvailLoans3.setActionCommand("Loans3");

You do not check for ActionCommand Loans1, Loans2, Loans3
in your actionPerformed()

Even worst, in you select a Graph in your actionPerformed you do


		  if (source == graph)
		  {
		// constructs File menu and populates
		Menu mnuAvailLoans = new Menu("Available Loans", true);
		mnuMyBar.add(mnuAvailLoans);
			MenuItem mnuAvailLoans1 = new MenuItem("5.35% Interest at 7 Years");
			mnuAvailLoans.add(mnuAvailLoans1);
			MenuItem mnuAvailLoans2 = new MenuItem("5.50% Interest at 15 Years");
			mnuAvailLoans.add(mnuAvailLoans2);
			MenuItem mnuAvailLoans3 = new MenuItem("5.75% Interest at 30 Years");
			mnuAvailLoans.add(mnuAvailLoans3);

		// add ActionListener to menu items
		mnuMyFileExit.addActionListener(this);
		mnuAvailLoans1.addActionListener(this);
		mnuAvailLoans2.addActionListener(this);
		mnuAvailLoans3.addActionListener(this);

		// add ActionCommand to menu items
		mnuMyFileExit.setActionCommand("Exit");
		mnuAvailLoans1.setActionCommand("Loans1");
		mnuAvailLoans2.setActionCommand("Loans2");
		mnuAvailLoans3.setActionCommand("Loans3");

When you will try to check for Loans1, Loans2, Loans3 it wont be obvious to find out if they are coming from which JFrame

The way to commented out load() is not good


//reading from sequential file
	 public void load()
	 {
					  return;
	 }

		  Reader fis;
		  {
			try
			   {

Ok load() does nothing;

There is an instance variable fis of type Reader which is created
and the code

 
{
	try
		{
	 ....		

}  // up to the close bracket

is executed as static code at the first creation of an object of type Mortgage5

you should do:

 //reading from sequential file
	 public void load()
	 {
		  Reader fis = null;
		  if(fis == null)
			  return;
		  {
			try
			   {

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Page 1 of 1

Help with display

Java Gui with display

3 Replies - 905 Views - Last Post: 17 May 2008 - 09:51 AM Rate Topic:

#1 msnider9

Help with display

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#2 pbl

Re: Help with display

#3 msnider9

Re: Help with display

#4 pbl

Re: Help with display

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