refresh JPanel containing JTable

[jess bianco]

i have a Jtable which i use only for display. i.e. no listeners etc. I put it on a JPanel.
i have another class which extends JFrame and i put all the buttons there. there is also the table with the loaded values from file.
the problem is that when i change the values i have to restart the program for the values to be seen,
any help on refreshing the panel when the user clicks on refresh?

[Rob Camick]

Without seeing your code its hard to guess what you are doing, but I will guess that your problem is that you are creating a new JTable when you are attempting to refresh the data. This is the wrong approach. The solution is to create a new TableModel and add it to the existing table. Something like:

DefaultTableModel model = new DefaultTableModel(...);
table.setModel( model );

[jess bianco]

here is my code

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

public class mainWindow2 extends JFrame implements MouseListener {

    private JPanel northPanel, centerPanel, eastPanel, westPanel, southPanel;
    private JButton addEBook, modifyEBook, deleteAllEBooks, viewAll, refresh;
    private View viewEBooks;

    public mainWindow2() throws Exception {
        super("EBook Manager");
        Build();
    }

    public void Build() throws Exception {

        //layouts        
        FlowLayout f1 = new FlowLayout(FlowLayout.CENTER);
        FlowLayout f2 = new FlowLayout(FlowLayout.LEFT);
        BorderLayout b1 = new BorderLayout(0, 10);
        setLayout(b1);

        //panels buttons etc        
        northPanel = new JPanel(f2);
        centerPanel = new JPanel(f1);
        southPanel = new JPanel();
        eastPanel = new JPanel();
        westPanel = new JPanel();

        modifyEBook = new JButton("Modify EBook");
        addEBook = new JButton("Add EBook");
        deleteAllEBooks = new JButton("delete all EBooks");
        viewAll = new JButton("View all");
        refresh = new JButton ("Refresh");

        modifyEBook.addMouseListener(this);
        addEBook.addMouseListener(this);
        deleteAllEBooks.addMouseListener(this);
        viewAll.addMouseListener(this);
        refresh.addMouseListener(this);

        //north south east west center
        northPanel.add(refresh);
        northPanel.add(viewAll);
        northPanel.add(addEBook);
        northPanel.add(modifyEBook);
        northPanel.add(deleteAllEBooks);
        
        viewEBooks = new View();
        centerPanel.add(viewEBooks);

        

        add(centerPanel, BorderLayout.CENTER);
        add(northPanel, BorderLayout.NORTH);
        add(southPanel, BorderLayout.SOUTH);
        add(westPanel, BorderLayout.WEST);
        add(eastPanel, BorderLayout.EAST);

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(550, 550);
        setResizable(true);
        setAlwaysOnTop(true);
        setVisible(true);
    }

    public void mouseClicked(MouseEvent e) {
        if (e.getSource().equals(viewAll)) {
            try{
            ViewEBooks veb = new ViewEBooks();
        
        }catch(Exception f){}
        }
        if (e.getSource().equals(refresh)) {
            try{
                
                
                //refresh panel here

                    
        }
        catch(Exception f){}
        }
        if (e.getSource().equals(modifyEBook)) {
            ModifyEBook meb = new ModifyEBook();
        }
        if (e.getSource().equals(addEBook)) {

            AddEBook aeb = new AddEBook();
        }
        if (e.getSource().equals(deleteAllEBooks)) {

            DeleteAllEBooks daeb = new DeleteAllEBooks();
        }
    }

    public void mouseEntered(MouseEvent e) {
    }

    public void mouseExited(MouseEvent e) {
    }

    public void mousePressed(MouseEvent e) {
    }

    public void mouseReleased(MouseEvent e) {
    }

}

----------------------------------------------------------------------

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.util.*;


public class View extends JPanel{

	public View() throws Exception {
		
		build();
	}

	public void build() throws Exception {

		EBookVector ev = new EBookVector(new File("ebooks.dat"));

		Vector allElements = new Vector();
		for (int i = 0; i < ev.size(); i++) {
			Vector rowData = new Vector();
						
				EBook e = (EBook) ev.elementAt(i);	
				rowData.add(i);
				rowData.add( e.getTitle());
				rowData.add( e.getAuthor());
				rowData.add( e.getSeries());
				rowData.add( e.getBkNo());
				rowData.add( e.getRead());

			allElements.add(rowData);

		}

		Vector<String> colNames = new Vector<String>();
		colNames.addElement("Pos");
		colNames.addElement("Title");
		colNames.addElement("Author");
		colNames.addElement("Series");
		colNames.addElement("Book no");
		colNames.addElement("Read");

		JTable table = new JTable(allElements, colNames);
		JScrollPane scrollPane = new JScrollPane(table);
		add(scrollPane);		
		
		setSize(500, 500);

		}
}

[Maneesh Godbole]

Jess,
Welcome to the Ranch.

In future, while posting code, please UseCodeTags
Also do check out these tips on getting the most out of the Ranch

[Michael Dunn]

you have a file
your program reads this file and displays the data in a JTable
you change the contents of the file, but not via your program.
you want the changes reflected in the JTable

is this correct so far?