JButton in JTable with custom table model

I want to include a JButton into a field of a JTable. I do not know why Java does not provide a standard renderer for JButton like it does for JCheckBox, JComboBox and JTextField. I found some previous postings on how to implement custom CellRenderer and CellEditor in order to be able to integrate a button into the table. In my case I am also using a custom table model and I was not able to create a clickable button with any of the resources that I have found. The most comprehensive resource that I have found is this one: http://www.java2s.com/Code/Java/Swing-Components/ButtonTableExample.htm.
It works fine (rendering and clicking) when I start it. However, as soon as I incorporate it into my code, the clicking does not work anymore (but the buttons are displayed). If I then use a DefaultTableModel instead of my custom one, rendering and clicking works again. Does anyone know how to deal with this issue? Or does anyone have a good pointer to a resource for including buttons into tables? Or does anyone have a pointer to a resource that explains how CellRenderer and CellEditor work and which methods have to be overwritten in order to trigger certain actions (like a button click)?

Yes, you were right, the TableModel was causing the trouble, everything else worked fine. Somehow I had this code (probably copy and pasted from a tutorial - damn copy and pasting) in my TableModel:
        public boolean isCellEditable(int row, int col) {
            //Note that the data/cell address is constant,
            //no matter where the cell appears onscreen.
            if (col < 3) {
                return false;
            } else {
                return true;
}A pretty stupid thing when you want to edit the 3rd column...

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  • JTable with custom column model and table model not showing table header

    I am creating a JTable with a custom table model and a custom column model. However the table header is not being displayed (yes, it is in a JScrollPane). I've shrunk the problem down into a single compileable example:
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    Kleopatra wrote:
    jduprez wrote:
    See http://download.oracle.com/javase/6/docs/api/javax/swing/table/TableColumn.html#setHeaderValue(java.lang.Object)
    When the TableColumn is created, the default headerValue  is null
    So, the header ends up rendered as an empty label (probably of size 0 if the JTable computes its header size based on the renderer's preferred size).nitpicking (can't resist - the alternative is a cleanup round in some not so nice code I produced recently <g>):
    - it's not the JTable's business to compute its headers size (and it doesn't, the header's the culprit.) *> - the header should never come up with a zero (or near-to) height: even if there is no title shown, it's still needed as grab to resize/move the columns. So I would consider this sizing behaviour a bug.*
    - furthermore, the "really zero" height is a longstanding issue with MetalBorder.TableHeaderBorder (other LAFs size with the top/bottom of their default header cell border) which extends AbstractBorder incorrectly. That's easy to do because AbstractBorder itself is badly implemented
    Thanks for the opportunity to have some fun :-)
    JeanetteNo problem, thanks for the insight :)

  • JTable column headers not displaying using custom table model

    I'm attempting to use a custom table model (by extending AbstractTableModel) to display the contents of a data set in a JTable. The table is displaying the data itself correctly but there are no column headers appearing. I have overridden getColumnName of the table model to return the correct header and have tried playing with the ColumnModel for the table but have not been able to get the headers to display (at all).
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  • JTable: Custom Table Model (pII)

    As was explained in pI, I'm creating a custom table model to overcome a few pitfalls I came across using the DefaultTableModel class, such as aligning cells, and getting certain columns to return only numeric type data. However, I've come upon a few roadblocks myself.
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    I just got this response. Anyways, I found another solution that was, interestingly, from one of your threads written in 2005.
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    Here's the code:package Practice;
      import java.awt.BorderLayout;
      import java.awt.Frame;
      import java.awt.Menu;
      import java.awt.MenuBar;
      import java.awt.MenuItem;
      import java.awt.MenuShortcut;
      import java.awt.event.ActionEvent;
      import java.awt.event.ActionListener;
      import java.awt.event.KeyEvent; // for MenuItem shortcuts
      import java.awt.event.WindowAdapter;
      import java.awt.event.WindowEvent;
      import java.awt.event.WindowListener;
      import javax.swing.JOptionPane;
      import javax.swing.JScrollPane; // JTable added to it, aiding flexibility
      import javax.swing.JTable; // The personally preferred GUI for this purpose
            // Provides a basic implementation of TableModel
      import javax.swing.table.DefaultTableModel;
              // This class uses Vector to store the rows and columns of data, though
              // programmer will be using LinkedLists
      import java.util.LinkedList;
      // User-defined classes
      import Practice.MusicDatabase;
      public class MusicBank extends Frame implements ActionListener
         MusicDatabase mDBase;
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         String title = "",      // Frame's title
                file = "";           // pathname of the file to be opened
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         Menu recordM; // ...
         // recordM
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        DefaultTableModel recordDetails;
        JTable recordsTable;
        LinkedList musicList;
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            musicList = new LinkedList();
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            frame.addWindowListener(new WindowAdapter()
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         recordDetails.addColumn("Music Company");
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         recordDetails.addRow(populateRow("", "", "", 0, 0.00f));
         // Creating the table to display the data files (music record details)
         recordsTable = new JTable(recordDetails)
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             // overloading the getColumnClass() method
            public Class getColumnClass(int column)
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      public MenuBar menuSystem()
          MenuBar bar = new MenuBar();
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          recordM = new Menu("Record");
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          newRecordR_MI = new MenuItem("New record");
          newRecordR_MI.setShortcut(new MenuShortcut(KeyEvent.VK_N, false));
          deleteRecordR_MI = new MenuItem("Delete record");
          deleteRecordR_MI.setShortcut(new MenuShortcut(KeyEvent.VK_D, false));
            // Enabling menus with functionality
           // Adding menus and items to menu bar
           return bar;        
      public void actionPerformed(ActionEvent ae)
          if(ae.getSource() == newRecordR_MI)
          else if(ae.getSource() == deleteRecordR_MI)
      // Object that will be used, in conjunction with MusicDatabase's, to 
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      // A record in a JTable is equivalent to an element in a LinkedList
      public Object[] populateRow(String title, String name, String comp, int rank, float price)
          // First, update the LinkedList
          mDBase = new MusicDatabase(title, name, comp, rank, price);
           // Then, update the table
           // As the parameters of Object tableDetails can only take a String or
           // object, rank and price will have to be cast as a String and later
           // parsed to their original form before use.
           String rankPT = ""+rank, pricePT = ""+price;        
           Object rowDetails[] = {title, name, comp, rankPT, pricePT};
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          MusicBank app = new MusicBank();
           // Using the platform's L&F (if Win32,  Windows L&F; Mac OS, Mac OS L&F,
           // Sun, CDE/Motif L&F)
           // For more on this, refer to the WinHelp Java tutorial by F. Allimont
           catch(Exception e)
                    "Failed to create the Windows Look and Feel for this program",
                    "Look and Feel (L&F) error",
           app.frame.setSize(500, 500);
            // Placing frame in the centre of the screen on-loading
      // action methods per menu items
      // Also, why do I keep getting an ArrayIndexOutOfBoundsException
      // here? I do know what this exception is, and how it works, but just cannot
      // understand what is causing it
      public void newRecord()
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          // entries. If not, either display a message (JOptionPane) or disallow
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          // Proceed based on assesment
          if(queryState() == true)
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              JOptionPane.showMessageDialog(this, // current frame
                       "There are incomplete cells in the table."+
                       "\nPlease fill these in before proceeding",       // Message to user
                       "Incomplete entries",                                // Title
                       JOptionPane.ERROR_MESSAGE);                           // Relevant icon
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               // updated, JOptionPane's input dialogs are used to temporarily store
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              titleN = JOptionPane.showInputDialog(this, "Enter song title");
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             System.out.println("JTable rows after creation = "+
         // Enabling the delete record menu item (as necessary)
         if((recordsTable.getRowCount()) > 0)
      } // newRecord()
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          System.out.println("Existing rows = "+recordsTable.getRowCount());
           // If there are no more rows, disallow user from trying to delete rows
           if(selectedRow <= 0)
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      // Method to query if all cells have changed their states (empty or not)
      public boolean queryState()
          // Obtaining number of rows
          int rows = recordDetails.getRowCount();
          int columns = recordDetails.getColumnCount();
          boolean isEmpty = false; // cell
          System.out.println("Rows = "+rows);
          System.out.println("Columns = "+columns);
              // Assessing all cells for complete entries
              // This approach is flexible, rather than hardcoding the rows available,
              // making it more reusable (assuming it will always be 5 columns)
              for (int rowIndex = 0; rowIndex<=rows; ++rowIndex)
                  if((recordDetails.getValueAt(rowIndex, 1)).equals(""))
                 isEmpty = true;
                  else if((recordDetails.getValueAt(rowIndex, 2)).equals(""))
               isEmpty = true;
                  else if((recordDetails.getValueAt(rowIndex, 3)).equals(""))
               isEmpty = true;                
                  else if((recordDetails.getValueAt(rowIndex, 4)).equals("0"))
               isEmpty = true;
                  else if((recordDetails.getValueAt(rowIndex, 5)).equals("0.00"))
               isEmpty = true;
          catch(Exception e)
          return isEmpty;
      Now here is the code for the MusicDatabase class
    package Practice;
    class MusicDatabase
        private String songTitle, identity, musicCompany;
        private int rank;
        private float priceF;
        // Defining the constructor
        public MusicDatabase(String title, String name, String company,                                int rankingInt, float price)
           songTitle = title;
           identity = name;
           musicCompany = company;
           rank = rankingInt;
           priceF = price;
        } // constructor
       // Other methods
    } // class MusicDatabaseSorry, but am not sure if these codes are executable, as where I am (a general library), JVM is not on the machine I am using. (Remember, i don't have ready acess to the Internet, so I could not use my machine, nor the facilities that had the JVM - unavailable to me at the time).
    PS I do hope the code pasted was not too much. Kind regards....

  • JTable: Custom Table Model (pI)

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