getting a table to refreshing upon clicking button

[Jason McKinley]

Hello all,

As the subject says, I am trying to get the table to refresh when I click the save button, which also adding more data. I have tried using:

model =(DefaultTableModel)table.getModel();
model.fireTableDataChanged();

In the action listener but it doesn't seem to work. Anyway what I am trying to do is make it where after it save the data, it refreshes the table to show that the new data has been added.

The code:

package testaddress;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.table.DefaultTableModel;



public class Testaddress extends JFrame {
   public static JTable table;
   public static DefaultTableModel model;
    
    public static void MyAddressBook(Container pane) throws FileNotFoundException{
        JLabel Name;
        pane.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.fill = GridBagConstraints.HORIZONTAL;
        
        Name = new JLabel("Name:");
        gbc.weightx = 0.5;
        gbc.gridx = 0;
        gbc.gridy = 0; 
        gbc.anchor = GridBagConstraints.NORTH;       
        pane.add(Name, gbc);
        
        final JTextField textName = new JTextField();
        gbc.weightx = 0.5;
        gbc.gridx = 1;
        gbc.gridy = 0;
        gbc.anchor = GridBagConstraints.NORTH;
        pane.add(textName, gbc);
        
        JLabel HPhone = new JLabel("Home Phone #:");
        gbc.weightx = 0.5;
        gbc.gridx = 2;
        gbc.gridy = 0;
        gbc.anchor = GridBagConstraints.NORTH;
        pane.add(HPhone, gbc);
        
        final JTextField textHPhone = new JTextField();
        gbc.weightx = 0.5;
        gbc.gridx = 3;
        gbc.gridy = 0;
        gbc.anchor = GridBagConstraints.NORTH;
        pane.add(textHPhone, gbc);
       
       JLabel CellPhone = new JLabel("Cell Phone #:");
       gbc.weightx = 0.5;
       gbc.gridx = 0;
       gbc.gridy = 1;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(CellPhone, gbc);
       
       final JTextField textCPhone = new JTextField();
       gbc.weightx = 0.5;
       gbc.gridx = 1;
       gbc.gridy = 1;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(textCPhone, gbc);
       
       JLabel Address = new JLabel("Address");
       gbc.weightx = 0.5;
       gbc.gridx = 2;
       gbc.gridy = 1;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(Address, gbc);
       
       final JTextField textAddress = new JTextField();
       gbc.weightx = 0.5;
       gbc.gridx = 3;
       gbc.gridy = 1;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(textAddress, gbc);
       
       JLabel City = new JLabel("City:");
       gbc.weightx = 0.5;
       gbc.gridx = 0;
       gbc.gridy = 2;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(City, gbc);
       
       final JTextField textCity = new JTextField();
       gbc.weightx = 0.5;
       gbc.gridx = 1;
       gbc.gridy = 2;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(textCity, gbc);
       
       JLabel State = new JLabel("State:");
       gbc.weightx = 0.5;
       gbc.gridx = 2;
       gbc.gridy = 2;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(State, gbc);
       
       final JTextField textState = new JTextField();
       gbc.weightx = 0.5;
       gbc.gridx = 3;
       gbc.gridy = 2;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(textState, gbc);
       
       JLabel Zip = new JLabel("Zipcode:");
       gbc.weighty = 0.1;
       gbc.weightx = 0.5;
       gbc.gridx = 0;
       gbc.gridy = 3;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(Zip, gbc);
       
       final JTextField textZip = new JTextField();
       gbc.weighty = 0.1;
       gbc.weightx = 0.5;
       gbc.gridx = 1;
       gbc.gridy = 3;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(textZip, gbc);
       
       JLabel Country = new JLabel("Country:");
       gbc.weightx = 0.5;
       gbc.gridx = 2;
       gbc.gridy = 3;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(Country, gbc);
       
       final JTextField textCountry = new JTextField();
       gbc.weighty = 0.1;
       gbc.weightx = 0.5;
       gbc.gridx = 3;
       gbc.gridy = 3;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(textCountry, gbc);
       
       JButton exit = new JButton("Exit");
       gbc.weightx = 0.5;
       gbc.gridx = 3;
       gbc.gridy = 5;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(exit, gbc);
       
       JButton save = new JButton("Save");
       gbc.weightx = 0.5;
       gbc.gridx = 2;
       gbc.gridy = 5;
       gbc.anchor = GridBagConstraints.NORTH;
       pane.add(save, gbc);
       
       JSeparator sep = new JSeparator();
       sep.setPreferredSize(new Dimension(5,1));
       gbc.weighty = 0.2;
       gbc.weightx = 0.5;
       gbc.gridx = 0;
       gbc.gridy = 7;
       gbc.gridwidth = 5;
       gbc.anchor = GridBagConstraints.CENTER;
       pane.add(sep, gbc);
       
    table = new JTable();
    JScrollPane scroll = new JScrollPane(table);
    String[] colNames = { "Name:", "Home Phone #:", "Cell Phone #:", "Address",
          "City:", "State:", "Zip Code:", "Country:"};
    model = new DefaultTableModel(colNames, 0);
    FileInputStream is;
    File f = new File("C://MyAddressBook.txt");
    is = new FileInputStream(f); 
    InsertData(is);
    gbc.weighty = 1;
    gbc.weightx = 0.5;
    gbc.gridx = 0;  
    gbc.gridy = 8;  
    gbc.gridwidth = 4;
    gbc.gridheight = 9;
    gbc.anchor = GridBagConstraints.CENTER;
    pane.add(new JScrollPane(table), gbc);
    
    
    save.addActionListener(new ActionListener() {
             
     @Override
     public void actionPerformed(ActionEvent e) {
     BufferedWriter writer;
     try {
     File file = new File("C://MyAddressBook.txt");
     writer = new BufferedWriter(new FileWriter("C://MyAddressBook.txt",true));
     writer.write(textName.getText() + "\t" + textHPhone.getText() 
     + "\t" + textCPhone.getText() + "\t" + textAddress.getText() + "\t"
     + textCity.getText() + "\t" + textState.getText() + "\t" + 
     textZip.getText() + "\t" + textCountry.getText());
     writer.newLine();
     writer.close();
     } catch(FileNotFoundException ex) {
     } catch (IOException ex) {
     }}});
    model =(DefaultTableModel)table.getModel();
    model.fireTableDataChanged();
    }                  

       
 public static void InsertData(FileInputStream is){
    Scanner scan = new Scanner(is);
    String[] array;
    while (scan.hasNextLine()) {
        String line = scan.nextLine();
        if(line.indexOf(",")>-1)
            array = line.split(",");
        else
            array = line.split("\t");
        Object[] data = new Object[array.length];
        System.arraycopy(array, 0, data, 0, array.length);
        model.addRow(data);
    }
    table.setModel(model);
    
    
}


    public static void main(String[] args) throws FileNotFoundException {
        JFrame frame = new Testaddress();
        frame.setTitle("My Address Book");
        frame.setSize(800, 600);
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        MyAddressBook(frame.getContentPane());
        frame.setVisible(true);
    }
}

[Rob Spoor]

You'll need to re-read the file again. The table model doesn't know it got its data from the file; it uses its own in-memory storage instead. By triggering that event it won't automatically refresh its data from the file.

[Jason McKinley]

Rob Spoor wrote:You'll need to re-read the file again. The table model doesn't know it got its data from the file; it uses its own in-memory storage instead. By triggering that event it won't automatically refresh its data from the file.

What would be the best code to do this with? You don't have to write out the code for me just point me in the direction I should be looking. I'm not looking for someone to write the code, I'd never learn that way :P

[Ranganathan Kaliyur Mannar]

You already have the code written for reading the file. You just have to refactor some of the code, like:
1) Change the method InsertData - this should clear the existing data in the model and then add the rows.
2) You can then call this method whenever you save the file.

[Jason McKinley]

Great, that's what I thought I would have to do. I just wanted to make sure before I did it, I am still so new to java and am not confident in myself yet. After your post I started playing around to that line of code and got it working just the way I wanted it to. Thanks for the help.

[Ranganathan Kaliyur Mannar]

You're welcome.