Rich Wilson

thanks I will check it out.

What would be the class or location that I could find information on creating graphs in Java? I am going to try and create a bar graph to read from an app that I got working with a lot of help. Any sugestions?

ok I am still lost here can someone edit this example from Sun to give me a better idea of what I am doing wrong? I can make it pull the data but not fill a combobox.

import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; import java.util.*; import java.text.SimpleDateFormat; /* ComboBoxDemo2.java is a 1.4 application that requires no other files. */ public class ComboBoxDemo2 extends JPanel implements ActionListener { static JFrame frame; JLabel result; String currentPattern; public ComboBoxDemo2() { setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS)); String[] patternExamples = { "dd MMMMM yyyy", "dd.MM.yy", "MM/dd/yy", "yyyy.MM.dd G 'at' hh:mm:ss z", "EEE, MMM d, ''yy", "h:mm a", "H:mm:ss:SSS", "K:mm a,z", "yyyy.MMMMM.dd GGG hh:mm aaa" }; currentPattern = patternExamples[0]; //Set up the UI for selecting a pattern. JLabel patternLabel1 = new JLabel("Enter the pattern string or"); JLabel patternLabel2 = new JLabel("select one from the list:"); JComboBox patternList = new JComboBox(patternExamples); patternList.setEditable(true); patternList.addActionListener(this); //Create the UI for displaying result. JLabel resultLabel = new JLabel("Current Date/Time", JLabel.LEADING); //== LEFT result = new JLabel(" "); result.setForeground(Color.black); result.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createLineBorder(Color.black), BorderFactory.createEmptyBorder(5,5,5,5) )); //Lay out everything. JPanel patternPanel = new JPanel(); patternPanel.setLayout(new BoxLayout(patternPanel, BoxLayout.PAGE_AXIS)); patternPanel.add(patternLabel1); patternPanel.add(patternLabel2); patternList.setAlignmentX(Component.LEFT_ALIGNMENT); patternPanel.add(patternList); JPanel resultPanel = new JPanel(new GridLayout(0, 1)); resultPanel.add(resultLabel); resultPanel.add(result); patternPanel.setAlignmentX(Component.LEFT_ALIGNMENT); resultPanel.setAlignmentX(Component.LEFT_ALIGNMENT); add(patternPanel); add(Box.createRigidArea(new Dimension(0, 10))); add(resultPanel); setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); reformat(); } //constructor public void actionPerformed(ActionEvent e) { JComboBox cb = (JComboBox)e.getSource(); String newSelection = (String)cb.getSelectedItem(); currentPattern = newSelection; reformat(); } /** Formats and displays today's date. */ public void reformat() { Date today = new Date(); SimpleDateFormat formatter = new SimpleDateFormat(currentPattern); try { String dateString = formatter.format(today); result.setForeground(Color.black); result.setText(dateString); } catch (IllegalArgumentException iae) { result.setForeground(Color.red); result.setText("Error: " + iae.getMessage()); } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("ComboBoxDemo2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. JComponent newContentPane = new ComboBoxDemo2(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }

am trying to populate a JComboBox named choices from an external file. I have the import/read portion working because if I add System.out.println(name[ i ]); to the code it will print the contents of the file on the screen. Is the code below correct to populate the box? I get an error code of "cannot find symbol" with eiter get or setText.

CODE

choices.getText(loan [ i ]);

I was putting the code in the wrong place in the code. I was trying to put the if statement in the listener instead of calculate() once I moved it the app worked like a charm.

I would like to say thank you for the help.

I figured it out by looking at it from several different angels.

The 0 string is null just so the box is blank when the app starts.

I think I have the code right but am not sure? I am trying to pass a value from a text field if the 1st string value is selected in a combo box (not 0 but 1)it works well from the menue but if I set it up and run the app the text field values are not passed. I have tried putting the commands in a new method but still the samething.

Any sugestions from the pros?
choices.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { if(choices.getSelectedIndex() ==1){ yearsField.setEditable(true); aprField.setEditable(true); aprnum = Double.parseDouble("0" + aprField.getText()); yearnum = Double.parseDouble("0" + yearsField.getText()); } else if(choices.getSelectedIndex() ==2){ yearsField.setEditable(false); aprField.setEditable(false); apr = 5.35; years = 7; } else if(choices.getSelectedIndex() == 3){ yearsField.setEditable(false); aprField.setEditable(false); apr = 5.5; years = 15; } else if(choices.getSelectedIndex() == 4){ yearsField.setEditable(false); aprField.setEditable(false); apr = 5.75; years = 30; } } });

thank you it worked like a champ. I was trying that once before but I was not including it in the correct method.

Can some one tell me what I am doing wrong here? I am trying to enable a listener to select the text from the combo box so I can set the string value from
String [] Irates ={"5.35","5.5","5.75"};
String [] Nyears = {"7","15","30"};

thses strings and assign them to these variables with a loop

double aprnum = Double.parseDouble("0" + apr.getText());
double yearnum = Double.parseDouble("0" + yearsField.getText());

I have read and tried this for the past 10 hours and everytime I get it setup where it will compile and run (I think) the buttons quit working.

http://java.sun.com/docs/books/tutorial/ui...html#uneditable

/* Modify the mortgage program to allow the user to input the amount of a mortgage and then select from a menu of mortgage loans: 7 year at 5.35%, 15 year at 5.5 %, and 30 year at 5.75%. Use an array for the different loans. Display the mortgage payment amount. Then, list the loan balance and interest paid for each payment over the term of the loan. Allow the user to loop back and enter a new amount and make a new selection, or quit. Insert comments in the program to document the program. Note: This program was written without a graphical user interface in POS406. */ import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.text.*; import javax.swing.JScrollPane; import java.awt.BorderLayout; import javax.swing.text.NumberFormatter; import java.text.ParseException; import java.text.DecimalFormat; import java.net.URL; public class Darrin_Wilson_week2 extends JFrame implements ItemListener,ActionListener { private boolean focusIsSet = false; Container pane = getContentPane(); //row1 String[] loan = { "","7 years @ 5.35%", "15 years @ 5.5%", "30 years @ 5.75%"}; String [] Irates ={"5.35","5.5","5.75"}; String [] Nyears = {"7","15","30"}; JPanel row1 = new JPanel(); JComboBox choices = new JComboBox(loan); JComboBox petList = new JComboBox(Irates); JLabel rate = new JLabel("Loan type", JLabel.LEFT); JLabel amount = new JLabel("Amount Financed",JLabel.CENTER); JTextField apr = new JTextField (8); JTextField amountField = new JTextField (8); JTextField yearsField = new JTextField (8); //Table Panel JTextField paymentField = new JTextField (8); JTextField totalField = new JTextField (8); JTextArea DataDisplay = new JTextArea(); //row5 JPanel row5 = new JPanel(); JButton close = new JButton("Exit"); JButton start = new JButton("Run"); JButton clear = new JButton("Reset"); public Darrin_Wilson_week2() { super("Week 2 mortgage app"); JScrollPane scrollPane = new JScrollPane(DataDisplay); //button listner close.addActionListener(this); start.addActionListener(this); clear.addActionListener(this); choices.addActionListener(this); //Create the combo box, select the item at index 4. //Indices start at 0, so 4 specifies the pig. choices.setSelectedIndex(0); choices.addActionListener(this); //pane layout setSize(650, 250); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container pane = getContentPane(); //row1 row1.add(rate); row1.add(choices); row1.add(amount); row1.add(amountField); row1.setBackground(Color.white); row1.setPreferredSize(new Dimension(250, 50)); pane.add(row1, BorderLayout.PAGE_START); // Table Panel scrollPane.setPreferredSize(new Dimension(200, 200)); pane.add(scrollPane, BorderLayout.CENTER); DataDisplay.setEditable(false); DataDisplay.setBackground(Color.white); setContentPane(pane); //row5 row5.add (start); row5.add (clear); row5.add (close); row5.setBackground(Color.blue); row5.setPreferredSize(new Dimension(200, 50)); pane.add(row5, BorderLayout.PAGE_END); setVisible(true); } //set focus on reset button private void setFocus() { if (!focusIsSet) { apr.requestFocus(); focusIsSet = true; } } public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); //button commands if (command == "Reset") clearAllFields(); if (command=="Run") calculate(); if (command == "Exit") close(); } void clearAllFields(){ paymentField.setText(null); apr.setText(null); yearsField.setText(null); amountField.setText(null); totalField.setText(null); DataDisplay.setText(null); apr.requestFocus(); focusIsSet = true; } void close(){ System.exit(-0);} void calculate() { DataDisplay.append("Month\tPrincipal\tIntrest\tBalance\n"); DataDisplay.append("\tPayment\tPayment\n"); DataDisplay.append("----------------------------------------------------------------------------\n"); //set text field input to double value double aprnum = Double.parseDouble("0" + apr.getText()); double yearnum = Double.parseDouble("0" + yearsField.getText()); double amtnum = Double.parseDouble("0" + amountField.getText()); //compute mortgage payment double a = aprnum; double m = yearnum*12; double b=((a/1200)+((a/1200)/(Math.pow((1+(a/1200)),(m))-1)))*amtnum; //output payment DecimalFormat AmountFormat = new DecimalFormat("$#####0.00"); String output = AmountFormat.format(b); paymentField.setText(""+output); //compute total of all payments double t=b*m; output = AmountFormat.format(t); totalField.setText(""+output); } public void itemStateChanged(ItemEvent event) { Object item = event.getItem(); } public static void main(String[] arguments) { Darrin_Wilson_week2 frame = new Darrin_Wilson_week2(); } }

what is the best way to size a pane with 3 rows where the top and bottom pane only have a text block or buttons but the middle pane has a scroll pane? I have the pane set up for grid layout now but all of the rows are sizing the same. Any sugestions?

Thanks for all of the help.

OK I found it and just about have it working. I am having two issues now and I think they are dumb problems.

1. when I compile and run I don't get the column names to print.
2. what is the correct format to pull data? I am trying to get the data fields to update into the table once I push the run button. I think I have most of it figured out but ths is just knawing at me that I can't get this working.
import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; import javax.swing.event.*; import java.text.*; import java.awt.TextComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; public class week3 extends JFrame implements ItemListener,ActionListener { private boolean focusIsSet = false; //row1 JPanel row1 = new JPanel(); JLabel rate = new JLabel("APR", JLabel.CENTER); JLabel amount = new JLabel("Amount Financed",JLabel.CENTER); JLabel years = new JLabel("Years Financed",JLabel.CENTER); JTextField apr = new JTextField (8); JTextField amountField = new JTextField (8); JTextField yearsField = new JTextField (8); //row3 JPanel row3 = new JPanel(); JLabel payment = new JLabel("Monthly payment",JLabel.CENTER); JLabel total = new JLabel("Total of payments",JLabel.CENTER); JTextField paymentField = new JTextField (8); JTextField totalField = new JTextField (8); //row5 JPanel row5 = new JPanel(); JButton close = new JButton("Exit"); JButton start = new JButton("Run"); JButton clear = new JButton("Reset"); //table String[] columnNames = {"Month","Payment","Intrest","Balance"}; Object[][] data = {{"Kathy", "Walrath","Knitting", (("")+ totalField.getText()),new Boolean(true)}, {"Sharon", "Zakhour","Speed reading", new Integer(20), new Boolean(true)}, {"Philip", "Milne","Pool", new Integer(10), new Boolean(false)}}; final JTable table = new JTable(data, columnNames); JScrollPane scrollPane = new JScrollPane(table); public week3() { super("Week 2 mortgage app"); //button listner close.addActionListener(this); start.addActionListener(this); clear.addActionListener(this); //pane layout setSize(650, 350); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container pane = getContentPane(); //row1 FlowLayout layout1 = new FlowLayout(FlowLayout.CENTER,8,8); row1.setLayout(layout1); row1.add(rate); row1.add(apr); row1.add(amount); row1.add(amountField); row1.add(years); row1.add(yearsField); pane.add(row1).setBackground(Color.red); //row3 FlowLayout layout3 = new FlowLayout(FlowLayout.CENTER,8, 8); row3.setLayout(layout3); row3.add(payment); row3.add(paymentField).setForeground(Color.blue); paymentField.setEditable(false); row3.add(total); row3.add(totalField).setForeground(Color.blue); totalField.setEditable(false); pane.add(row3).setBackground(Color.white); //table GridLayout layout6 = new GridLayout(0,1); setLayout(layout6); add(scrollPane); table.setPreferredScrollableViewportSize(new Dimension(400, 70)); pane.add(table); //row5 FlowLayout layout5 = new FlowLayout(FlowLayout.CENTER,8, 8); row5.setLayout(layout5); row5.add (start); row5.add (clear); row5.add (close); pane.add (row5).setBackground(Color.blue); setVisible(true); } //set focus on reset button private void setFocus() { if (!focusIsSet) { apr.requestFocus(); focusIsSet = true; } } public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); //button commands if (command == "Reset") clearAllFields(); if (command=="Run") calculate(); if (command == "Exit") close(); } void clearAllFields(){ paymentField.setText(null); apr.setText(null); yearsField.setText(null); amountField.setText(null); totalField.setText(null); apr.requestFocus(); focusIsSet = true; } void close(){ System.exit(-0);} void calculate() { //set text field input to double value double aprnum = Double.parseDouble("0" + apr.getText()); double yearnum = Double.parseDouble("0" + yearsField.getText()); double amtnum = Double.parseDouble("0" + amountField.getText()); //compute mortgage payment double a = aprnum; double m = yearnum*12; double b=((a/1200)+((a/1200)/(Math.pow((1+(a/1200)),(m))-1)))*amtnum; //output payment DecimalFormat AmountFormat = new DecimalFormat("$#####0.00"); String output = AmountFormat.format(b); paymentField.setText(""+output); //compute total of all payments double t=b*m; output = AmountFormat.format(t); totalField.setText(""+output); } public void itemStateChanged(ItemEvent event) { Object item = event.getItem(); } public static void main(String[] arguments) { week3 frame = new week3(); } }

[ July 04, 2005: Message edited by: Rich ]
[ July 04, 2005: Message edited by: Rich ]

Could someone post a code example to prolerly setup a text area? I have to wirte an app to display an amortization table from a previously created application. I think the JTextArea is the way to go but am unsure if I am on the right track or not.

I am trying to figure out the correct way to setSize on the following:

JFormattedTextField apr = new JFormattedTextField(percentFormat);

I tried adding set.Size(100,50); and various other sizes in the add statement is this the correct way to do it or am I way off course?

Thank you I was hoping it was something stupid and it was. I guess it is just something that only time and experience will fix.