Text area

[Rich Wilson]

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.

[Sonny Gill]

How to Use Text Areas

The magical google query used -

http://www.google.com/search?q=java%20tutorial%20swing%20jtextarea

[Rich Wilson]

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 ]