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Table Button Column

Posted by Rob Camick on July 12, 2009

A JTable is used to disply rows of data. There may be times when you want to do some processing on a row of data. Maybe you want to display a popup form with more details or maybe you simply want to delete a row. In these cases it may be desireable to add a button to one of the table columns so you can invoke this processing. The problem is that JTable doesn’t support a button renderer or editor.

After playing around a bit, the best solution I could come up with was to create a class that is both a renderer and an editor. The result is the ButtonColumn class. You store text (or an Icon) in the TableModel (the same way you store data for any other column) and the ButtonColumn will render the text (or the Icon) on a button. When you create the class you specify an Action that is to be invoked when the button is pressed. You also specify the column that is used to contain the button so that the renderer and editor can be automatically installed on the appropriate TableColumn of the TableColumnModel.

A table using a ButtonColumn as a renderer would look like this:

Table-Button-Column

The button can be invoked by using the mouse or the keyboard. Using the Metal or Windows LAF you would use the space bar to invoke the button (I’m not sure about other LAF’s). You can also set a mnemonic to invoke the button. You can set the mnemonic using the setMnemonic() method. In the example above I used KeyEvent.VK_D as the mnemonic.

Notice how the border on the first button is a different color? This indicates that the button has focus and can be invoked by using the keyboard as mentioned above. I decided to use this approach since I couldn’t figure out how to invoke the normal “focus painted” code on a rendered button. You can change the Border using the setFocusBorder() method.

The key to the ButtonColumn class is the usage of an Action to perform the custom processing. When the button is clicked an ActionEvent is created and the actionPerformed() method of the Action is invoked. The table will be the source of the event. Also, the action command will contain the “model” row number of the clicked button. The reason for passing a row number is that multiple rows could be selected so you can’t depend on the table.getSelectedRow() method to return the appropriate row number. The reason for passing the model row is so you can access the TableModel using the same index whether the table uses a RowSorter or not.

The code to create the data as shown in the table could be something like:

String[] columnNames = {"First Name", "Last Name", ""};
Object[][] data =
{
	{"Homer", "Simpson", "delete Homer"},
	{"Madge", "Simpson", "delete Madge"},
	{"Bart",  "Simpson", "delete Bart"},
	{"Lisa",  "Simpson", "delete Lisa"},
};

DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable( model );

The code to delete a row from a table using the DefaultTableModel would be:

Action delete = new AbstractAction()
{
    public void actionPerformed(ActionEvent e)
    {
        JTable table = (JTable)e.getSource();
        int modelRow = Integer.valueOf( e.getActionCommand() );
        ((DefaultTableModel)table.getModel()).removeRow(modelRow);
    }
};

ButtonColumn buttonColumn = new ButtonColumn(table, delete, 2);
buttonColumn.setMnemonic(KeyEvent.VK_D);

Of course you would probably want to add a confirm dialog before actually deleting the row. Anyway, hopefully you will find the ButtonColumn class easy to use.
 

Try The Demo

Launch – Using Java™ Web Start (JRE 6 required)

Get The Code

ButtonColumn.java

Related Reading

Java Tutorials: Concepts – Editors and Renderers

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116 Responses to “Table Button Column”

  1. sarcan said

    Hi Rob,

    always a pleasure reading your blog. There seems to be a glitch with this particular example, though. The actionCommand property generated by ButtonColumn contains the ‘view row’, not the ‘model row’. If you install a RowSorter on your table and change the row order you’ll end up deleting the wrong one, so the line in actionPerformed should probably read

    int row = table.convertRowIndexToModel(Integer.valueOf( e.getActionCommand()));

    best regards,
    sarcan

  2. Eitan said

    Hi Rob,

    Like Sarcan said “it is a pleasure”.

    If I am not mistaken you do not need
    the

    public void mouseMoved(MouseEvent e) {}

    • Rob Camick said

      Boy, I was sleeping while doing this one. Thanks, the line has been removed.

      Its nice to know people actually take the time to read and understand the code.

  3. André Uhres said

    Well done. Just one minor point: you use the terms “TableButton”, “TableColumn” and “ButtonColumn” to refer to the same class, which is a little bit confusing at first reading. I suppose you changed the class name and forgot to update the text.

  4. Anonymous said

    It’s not Madge, it’s Marge ;)

  5. Peter Hon said

    Hi rob,

    I am new to java programming and I have read the ButtonColumn.java source code. But I have no idea
    on how to use the ButtonColumn.java in my code. Can u suggest any complete example code that shows how
    to use ButtonColumn.java. i.e. A Class with main() using the ButtonColumn.java Code. Thanks.

    • Rob Camick said

      This is not a forum. If you don’t know how to create a JTable with data then post questions in a forum. Once you have a table created you create an Action. I posted the code for an example Action to delete a row from the table. I then gave you the 1 line of code needed to convert the text in a column to a button (the second line is optional). So all you have to do is copy/paste the code I gave you in this posting.

  6. Paul Humphrey said

    Excellent, Just what I needed
    Thanks!

  7. George Moralis said

    Using it with JXTable doesn’t seem to work. The event is never fired :(

  8. Michael B. said

    Hi, thanks for this neat article + code.
    I’m using ButtonColumn right now, however I don’t think I changed the button text right. At line 142, I changed the value inside renderButton.setText() to the text value that I want.

    I got the outcome that I wanted but you said the text would be stored in the TableModel.

    Sorry for asking such a question and thanks in advance!

    • Rob Camick said

      The text that you want to appear on the button is added to the TableModel the same way you add any other String for any other table column. There is no need for you change the code in the ButtonColumn class.

  9. Sanya said

    Hey Rob,
    I tried using your code. I need buttons in the 2nd and 3rd column of my table. I passed 2 as a parameter for column in ButtonColumn. However an action is performed when i click on any column in that particular row. I need an action to be performed only when i click on the 2nd column. Could you help?

    Regards,
    Sanya

    • Rob Camick said

      Sorry I don’t see the behaviour you describe. I updated this posting with a Webstart demo that shows the behaviour when you add the ButtonColumn to the 2nd column. If you see different behaviour then you can create a simple demo and email the SSCCE using the “Contact Us” page.

      • Sanya said

        Hey Rob,
        I tried mailing you by copy pasting the code in the message field. Please let me know in case of any problem. Thanks for your time.

        Regards,
        Sanya

  10. Anabel said

    Hi thnks for you code. It help me a lot.
    Right now Im trying to make buttons to open pdf files, Is there a way to create an action for each button? And giving them the path of the pdf?
    I hope you can help me thanks!

    • Rob Camick said

      One way is to have a separate column in the table with the PDF path. Then the Action can just get the path from the column. Or if you don’t want a separate column then you can add a custom object to the model. The object would contain the text to display on the button as well as the path of the PDF file. Then you would need to override the toString() method of the Object to return the text. The Action could then access the path.

      • Anabel said

        Thanks for the fast reply.
        I dont know what im doing wrong….

        (Rest of comment deleted…)

      • Rob Camick said

        I can’t tell from the code you posted what you are doing. Maybe if you email a proper SSCCE through the “Contact Us” page I can take a quick look.

  11. Anonymous said

    Nice article sir.
    Thanks.

  12. Umer said

    Sir I got a problem here…
    The problem is when i put a cell to editable false then this api is not working ….

  13. Anonymous said

    Nice post & nice comments

  14. daskhatri said

    Dear tell how do i use your code in my program , I developed a JTable that is filling data from database, now I need to add Jbutton in my table with each record… Button is not added yet. How proceed further , Do i have to just access your class in my table program? or first i have to add a JButton in table then access your code?

    please give me just five mints

    • Rob Camick said

      Forget about getting data from the database. First you need to understand how to use the class. So create a simple example with 3 columns like I display from the image. Once you get that working then move on to getting data dynamically from a database.

      You add data to the TableModel just like you do for any other column of data. Normally the data is just displayed as text. In the image from the blog there are 3 columns of data, firstName, lastName and an untitled column. In all 3 cases you add a String to the TableModel. For the first row you add “Homer”, “Simpson”, “delete Homer”. Then you add a custom renderer and editor to the 3rd column. Again the blog show how to do this and even includes code for a simple Action.

  15. parvathi said

    Hi Rob,

    Nice article..It would be great if you could explain why do we need to add mouse listener to the editor button, when we are already adding action listener.

    • Rob Camick said

      I explained that using comments in the code. I didn’t think it was necessary to repeat in the blog since the blog iis for an overview of the functionality, not a detailed look at each line of code.

  16. This code is exactly what I have been looking for, but I am having 2 issues. the first issue is the code only works if i remove the override for the following 2 lines. Also no actions are being done when i try to set the action. Any help would be appreciated.

    public Component getTableCellEditorComponent(
    public Object getCellEditorValue(){

    • Rob Camick said

      If you comment out those lines you defeat the purpose of using the custom editor. The code should work as is if you use the example code I provided in the blog. If you have problems using the example code then create an SSCCE and send me the code using the Contact Us page.

  17. Gerard said

    Worked great for me …. except: On Mac OS X the “Aqua” look and feel doesn’t respect JButton colors, so clicking on the Button causes it to go all white. I modified the code in getTableCellRendererComponent as follows as a work around:

    if (isSelected)
    {
    	LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
    	if (!lookAndFeel.getID().equals("Aqua")) 
    	{
    		renderButton.setForeground(table.getSelectionForeground());
    		renderButton.setBackground(table.getSelectionBackground());
    	}
    }
    
  18. Faisal said

    I am new to JAVA. I just wanted to know how to run this piece of code. Does it work as a sub routine in a actionlistener.

  19. Jimmy said

    Dear sir
    I found your sourse code very helpful.However, i have problems
    My table have the 9th colum is button column and 8th column is interger.
    How can add header sort in the 8th column, and repaint table, still keep button in the 9th column.
    As far as i know, to sort column, table need to extend AbstractTable Model.
    I apply:
    ButtonColumn buttonColumn = new ButtonColumn(table, myAction, 9). My 9th column goes wrong.
    Help me , please
    I’m very appreciated

    • Rob Camick said

      The ButtonColumn class is a custom renderer and editor which should not affect sorting so I’m not sure what your problem might be. However, if you have 9 columns then you should should be specifiy “8″, when you create the ButtonColumn class since JTable uses 0 as the offset to reference columns. To add sorting to the table I just use table.setAutoCreateRowSorter( true ) and it works for me.

  20. Great code – thanks so much for sharing! I’m using it an it works great, so all I could find was a comment typo: Optionally spelled with only one ‘l’ at line 14.
    I’m only trying to contribute to your great work by helping edit for you. :) Thanks again!
    -Travis

  21. Could you send Demo’s source code?

    • Rob Camick said

      The demo code shows mostly how to create a GUI. The blog shows the important couple of lines of code to use this class. You need a couple of lines of code to create an simple Action. Then you need a single line of code to create the class and use this Action. This class can be added to any column that renders text in the column.

  22. Dear Rob,

    thanks for your code. The button shows in column and gets focus when clicked, but no event is fired.

    public class ScriptTable extends JTable {
    ...
    final Action split = new AbstractAction() 
    {
    	@Override
    	public void actionPerformed(ActionEvent e) 
    	{
    		System.out.println("Clicked!"); // not fired
    	}
    };
    	
    buttonColumn = new ButtonColumn(this, split, 3);
    

    Maybe you have an idea what is wrong

    Thanks and greetings,
    Oliver

    • Rob Camick said

      Is the column editable? I believe it needs to be editable in order for the mouse event to be passed to the editor. Also just try a simple test by just create a normal JTable, instead of extending JTable. Maybe something in your custom table is causing a problem.

  23. Sterling said

    Thanks very much for this code. I am using it in an application where I have extended JTable to give me control over column widths. I am also using a unicode down facing triangle (basically I am going to emulate a menu opening from a cell) Your code worked basically dropping it in except that when it was initially rendered the text icon was off center to the right. when clicked it went centered and then when another button was clicked it went offset again. What I ended up doing was simply replacing the line

    originalBorder = editButton.getBorder();

    in the constructor with

    originalBorder = new LineBorder(new Color(122, 138, 153), 1);

    and this centered the text. I have no idea why and I am not saying this is a fault of your code just thought you may be interested in that use case.

  24. Gal said

    I’ve been working on my school project and needed it. I was gonna try and make such class with examples i found on the internet but now i can use this awesome class. You saved me an hour(probably even more) at class.
    Thanks :D

  25. t0th said

    Hi,

    i have Exception in thread “AWT-EventQueue-0″ java.lang.ArrayIndexOutOfBoundsException: 1 >= 0

    in line fireEditingStopped();

    can you help me?

    thanks

  26. Jay said

    Awesome Awesome Awesome, thanks a bunch very easy to use. I am happy you did not provide the ‘main’ class. Could not agree more with you, the more you dig/practice/read the more you learn.

  27. resahaw27 said

    thank you so much.. this is a very big help in my school project.. more power to you!! :D

  28. resa said

    i dont know if you can help me but how do i add an actionListener to the button.. i mean what button should i add the actionListener since there 2 jbuttons declared in the code.. i need to open a new jframe when i click the button but i dont know how to do that.. i hope you can help me with that.. thank you so much. :))

    • Rob Camick said

      You don’t add an ActionListener to either of the JButtons defined in the ButtonColumn class. You add the ActionListener to the ButtonColumn class when you create an instance of the class. I gave a simple example. If you want to open a frame then you need to change the code in my example to create and show a frame.

  29. teofil said

    first of all, thank you for all your work!
    secondly, i want to use this in multiple columns, specifically in the two last columns of the table
    but when i run the project only the last column shows the button, the other one nothing!
    do you see any reason for this to happen?

    well maybe it has to do with the fact that the editor and renderer is in one class!
    i am looking at this now and i will post if it makes any difference

    • Rob Camick said

      It works fine for me. You need to create two ButonColumn classes and Actions:

      ButtonColumn buttonColumn1 = new ButtonColumn(table, action1, 3);
      ButtonColumn buttonColumn2 = new ButtonColumn(table, action2, 4);
      
      • teofil said

        sorry about the fuss but you’re right
        it works the way i want, i just didn’t made the right adjustments to my code for adding it

        btw, i am thinking of using in another column a combobox instead of a button, does this code gives the way it can be done?
        a combobox to use for a field that has multiple values
        i haven’t searched anything yet, just asking

        and again thanks for all your work, very helpful!

  30. Anonymous said

    Thanx so much, it’s exactly what I needed!

  31. Jim said

    this is a lifesaver! thanx a lot. i would have taken months to figure this out on my own!

  32. Anonymous said

    Hi Rob,

    Thank you for sharing. I have been trying for some time now to make buttons either invisible or disabled, so that I couldn’t click on a button depending on other variable in the same row.
    Could you point me in the right direction of how should I approach this problem?

    Thank you,
    Borys

    • Rob Camick said

      To prevent a cell from being edited you would override the isCellEditable(…) method of your table model. If you wanted to render the button as disabled, then you would also need to add code in the getTableCellRendererComponent(…) to make the button appear disabled.

  33. Anonymous said

    thank you Rob :) this article was very helpful for my project…i want ask a question…how to add an image in the button..

  34. Isuru said

    Hi! Thanks for this class. Just what I was looking for. I have a clarification. To set a text for the button, you have to fill up the renderButton.setText( “” ); in the getTableCellRendererComponent() method, am I right? Or is there any other property or something to accomplish this?

    • Rob Camick said

      A renderer gets the data from the TableModel.

      • Isuru said

        Wait! I think I got it. I added “Reserve” to the end of model.addRow(new Object[] {rs.getString(“title”), rs.getString(“author”), rs.getString(“isbn”), rs.getString(“publisher”), “Reserve”}); and everything’s good now. I must have somehow missed the line ‘You store text (or an Icon) in the TableModel’ in the article. Thanks.

  35. tauruzian said

    How do I do if I want to delete just Homer instead the entire row.

  36. Katerina said

    Hi, excellent post like every others…but the method buttonColumn.setMnemonic(KeyEvent.VK_D); it didn´t work on my code, I try to change it to buttonColumn.setMnemonic(KeyEvent.VK_DELETE), to use the delete key , but when press it , nothing happens. Plz can u tell me what I´m doing wrong.?? Thx

    • Rob Camick said

      Focus must be on the cell. And you use Alt+D to invoke the Action.

      • Katerina said

        Thx, the problem was I forgott to press Alt key first.
        There is anyway to invoke the Action just pressing delete key ?

      • Rob Camick said

        Swing uses Key Bindings to invoke Actions with a KeyStroke. Search the blog for my Key Bindings entry and don’t forget to read the Swing tutorial on Key Bindings for a better understanding of how Key Bindings work.

        With regards to this class you can use the following code. Now pressing the key or Alt+key should invoke the Action.

        public void setMnemonic(int mnemonic)
        {
        	this.mnemonic = mnemonic;
        	renderButton.setMnemonic(mnemonic);
        	editButton.setMnemonic(mnemonic);
        
        	Action mnemonicAction = new AbstractAction()
        	{
        		public void actionPerformed(ActionEvent e)
        		{
        			ButtonColumn.this.actionPerformed(e);
        		}
        	};
        
        	String key = "mnemonicAction";
        	KeyStroke keyStroke = KeyStroke.getKeyStroke(mnemonic, 0);
        	editButton.getInputMap().put(keyStroke, key);
        	editButton.getActionMap().put(key, mnemonicAction);
        }
        
      • Katerina said

        Hi Rob, I have another problem when the focus is on the cell doesn´t change the shape it looks like. Did u understand me? The point is that I need the usser can note the difference between when have focus and when is not. Thanks for advance.

      • Rob Camick said

        The Border changes when the cell has focus.

  37. Muhammad Bilal said

    I am using ButtonColumn class to create a delete button in my JTable

    DefaultTableModel dtm = new DefaultTableModel() 
    {
    	public boolean isCellEditable(int row, int column) {
    			return true;
    	}
    };
    JTable jTable1 = new JTable(dtm);
    
    dtm.addColumn("Type");
    dtm.addColumn("Amount");
    dtm.addColumn("Details");
    dtm.addColumn("Status");
    dtm.addColumn("Operation,Delete");
    	
    JScrollPane jScrollPane1 = new JScrollPane(jTable1);
    frame.getContentPane().add(jScrollPane1);
    frame.setResizable(false);
    
    Action delete = new AbstractAction() 
    {
    	public void actionPerformed(ActionEvent e)
    	{
    		JTable table = (JTable)e.getSource();
    		int modelRow = Integer.valueOf( e.getActionCommand() );
    		((DefaultTableModel)table.getModel()).removeRow(modelRow);
    	}
    };
    
    ButtonColumn buttonColumn = new ButtonColumn(jTable1, delete, 3);
    buttonColumn.setMnemonic(KeyEvent.VK_DELETE);
    

    This is the code for jtable but there is no text show on button.I don’t know how to show the text using model.Can you please help me out

    • Rob Camick said

      You didn’t add any data to the model. You add the text you want displayed on the button to the model the same way you add text for any other column. By the way you are adding the ButtonColumn using index 3, which is your ”’Status” column. I would guess you want that to be index 4.

      • Muhammad Bilal said

        Thanks i got the point it is getting the values from model.Problem solved.Thanks for you help.

  38. Engr Asya said

    Hi…
    this Code works for me.. but i need some help.. i want to add button in jtable cell. i have used DefaultTableModel.
    Button Should display Link word, but when user click on it the save URL must be open in default Browser.. i have done so far retrived Link from databases but button making me confuse.. plz help

    • Rob Camick said

      I can’t help you write you Action. The Action is basically the same as writing an ActionListener and adding the listener to a JButton that is not displayed on the table. The main difference is that using this class you have direct access to the “row” where the button was clicked. When using a button outside the table you need to get the selected row of the table.

  39. bt said

    It is a very handy class that I find is extremely useful. I notice that both the ActionListener and MouseListener are implmented. The MouseListener is necessary to control the “editing” status at the right moment, but is the ActionListener a must? It seems that just construct the new ActionEvent in the MouseReleased() can do the same. Am I missing something?

    • Rob Camick said

      The ActionEvent is the important event to make sure the Action you supply is executed. The button can be invoked by the mnemonic (if one is set) or by using the space bar when the cell has focus or by clicking on the cell with the mouse. The MouseListener is just used to make sure the button is painted in a proper state. If the user click on one row and then releases the mouse over a different row (or column) you don’t want to execute the Action. A mouse click is defined by a pressed/released on the same cell.

  40. Chaitanya Dalvi said

    Thanks.. Its Very useful post..

    Please, can u help me?
    I hv Jtable with (ProductID, ProductName,Image) column
    I want button on ProductID column with text “Add”.
    When user click on button text change to “Remove” and row highligh with color.

    Actually i dont want to remove data from model, i just want show to product is added to cart..

    Please help…

    • Rob Camick said

      So you need to write a custom Action. I can’t help you with the Action because I don’t know how to show “a product is added to the cart”. If you want the text to change from “Add” to “Remove” then your custom Action will need to update the text in the TableModel. In addition your Action will need to check the current text in the model to determine what Action to perform. I suggest you start with a simple Action that just changes the text every time the button is clicked. Once you get that working then you implement the “add” and “remove” logic.

  41. olaxoamor said

    Thank you so much for this code! It is so useful. This may be a stupid question but where in ButtonColumn would I change the button default settings (size, color, etc)

    • Rob Camick said

      The size of the button will be the size of the cell. This is the way all renderers/editors work. You could change the margin (border) of the button. This would be done in the constructor when the buttons are created.

  42. John said

    Great post! It helped me a lot. But I have one question: why do you use an Action instead of an ActionListener. Using an ActionListener would make it easier because you only had to define the actionPerformed ().

    • Rob Camick said

      Actions are more powerful than ActionListeners and can be used anywhere an ActionListener is used even if you don’t use all the Action features. It is also easy to implement, you just extend AbstractAction and override the actionPerformed() method (as my example Action from the blog does).

  43. Ok, what does the Action do to the row involved? I thought columns were vertical.

    • Rob Camick said

      Yes, columns are vertical, but the Action can do whatever you want. Generally it would do something with the entire row. I gave an example of how you can add an Action to delete the row.

  44. I tried the following and it is having two columns of buttons. How do I get rid of the duplicate button column?

    import javax.swing.JTable;
    import javax.swing.JFrame;
    import javax.swing.table.TableColumn;
    
    public class TableTester2
    {
       public static void main(String[] args)
       {
          JFrame jf = new JFrame("Test 2");
          jf.setVisible(true);
          Object[][] values = new Object[2][2];
       
          for (int i = 0; i < values.length; i++)
          {
             for (int j =0; j < values[i].length; j++)
             {
                values[i][j] = "Data";
             }
          }
          
          Object[] headers = new Object[2];
          headers[0] = "Bob";
          headers[1] = "Mike";
          JTable jt = new JTable(values, headers);
          TableColumn tc = new TableColumn();
          jt.addColumn(tc);
          ButtonColumn bc = new ButtonColumn(jt, 
                new  javax.swing.AbstractAction()
                {
                   public void actionPerformed(java.awt.event.ActionEvent e)
                   {
                      System.out.println("Woo");
                   }
                }, 0);
                
          bc.getEditButton().setText("Edit");
          bc.getRenderButton().setText("Render");
          tc.setCellRenderer(bc);
          tc.setCellEditor(bc);
          jf.add(jt);
          jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       }
    }
    
    • Rob Camick said

      When you create a TableColumn you need to specify which column from the TableModel the data come from. By default it assumes column 0, which is the column you added the ButtonColumn to. You can’t just create TableColumns, you also need data in the TableModel. So when you create your model you need to specify 3 column headers and 3 columns of data for every row. Then you add the ButtonColumn to the last column.

      • How do you set the text of the JButton? I tried accessing the render and edit buttons and setting the text, but nothing is changing.

      • Rob Camick said

        What does my blog write up say? You should never play with the renderer or editor, they just display whatever is in the TableModel.

      • You have an example at the top that has text on them.

        Also, I removed the part that was messing with the render and edit button text.

        However, for some odd reason, now any JButton I add, even outside the JTable, doesn’t have text either. I’ve passed it a String as a param and also called the setText() and neither seems to work.

      • Rob Camick said

        Yes, that is the way JTable works. The blog states you can add text (or an Icon) to the model. Then the model value is rendered as a button. You DON”T add a JButton to the model, if that is what you are trying to do.

      • I posted some comments here but can’t seem to find them. Is there another page here somewhere? I had asked how to make it so that there is a button on all but the top row. It’s a formula table of a sort and the top row only holds a grand total. It should never be removed.

      • Rob Camick said

        You can override the getCellRenderer(…) and getCellEditor() methods of JTable to return a different renderer/editor. This is a general question about how table work and should be posted in a forum. It has nothing special to do with this class.

      • It is about the class. I do want the buttons there but as the top row contains the top row, I never want it to be able to be removed. I should be able to, knowing the row and column, be able to use the ActionListener in your class to ensure that it won’t remove if a button is clicked in the event that the button is in the top row.

        I am thinking that if I call setCellRenderer() and setCellEditor() that in there, if I give it a new CellEditor/Renderer, that I can override the getTableCellRenderer/EditorComponent method and can use the row and col values passed to it to return null in the case of that row where I don’t want it removed, but where might a NullPointerException be thrown if I did that? Also, now that I think of it, how do I keep what yours is doing for the other rows if I call these set methods? I’d need to override yours and call super and then just add an addition.

      • Rob Camick said

        It has nothing to do with this class. I would override the getCellRenderer method to return the renderer for Object.class, so it renders as a String. Then I would add an empty string to the model so there is nothing to renderer. Then I would also override the isCellEditable() method to return false for the top row (or whatever your exact requirement is).

  45. I was wondering, why would an additional button outside of the Table not show its text?

    Also, how do you disable one of the buttons, just one? There is something I want to use for that row that can’t allow it to be removed.

  46. How do you make sure that you have the buttons but that you can’t remove one of the rows (i.e. the top row)? (Preferably by not having the button in that row).

  47. Sultan said

    Tried this solution on your other class where you fill table with database, the one called “ListTableModel” and it doesn’t work, the buttons appear but they are not clickable. do you know why this is happening, maybe a workaround?

  48. Anonymous said

    What is this ..? this is not working..

    bc.getEditButton().setText(“Edit”);
    bc.getRenderButton().setText(“Render);

    • Rob Camick said

      Read the Swing tutorial on Concepts – Renderers and Editors that I provided above. It explains how renderers/editors work. All cells share the same renderer/editor, so you can’t just hard code the values. The values come from the model.

  49. karan said

    hi,
    am a new to swings ….i dint understand what that button class is doing, i want to retrieve data from database along with edit and delete button in the jtable………all i could do was to add data but not button any help?????

    thanks…

  50. JennyJintao said

    Hi, thanks for sharing your code. However, I wonder whether it is possible to add a button to a specific cell of a table, for example row=0, column=1, instead of adding a button to each row of the same column of the table?

    • Rob Camick said

      The TableButtonColumn class installs itself as the renderer for the entire column. You can override the getCellRenderer(…) and getCellEditor(…) methods. They both receive the row/column as a parameter, so if the row/column is the value you want you would invoke return super.getCellRenderer(…) and super.getCellEditor(…). Otherwise you would probably return the classes from the JTable.getDefaultRenderer(…) and JTable.getDefaultEditor(…) methods.

  51. Anonymous said

    Nice work!!!

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