Auto Resize JTable Column Width
This code should resize your JTable column width based on the contents of the header and data.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | public JTable autoResizeColWidth(JTable table, DefaultTableModel model) { table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); table.setModel(model); int margin = 5; for (int i = 0; i < table.getColumnCount(); i++) { int vColIndex = i; DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel(); TableColumn col = colModel.getColumn(vColIndex); int width = 0; // Get width of column header TableCellRenderer renderer = col.getHeaderRenderer(); if (renderer == null) { renderer = table.getTableHeader().getDefaultRenderer(); } Component comp = renderer.getTableCellRendererComponent(table, col.getHeaderValue(), false, false, 0, 0); width = comp.getPreferredSize().width; // Get maximum width of column data for (int r = 0; r < table.getRowCount(); r++) { renderer = table.getCellRenderer(r, vColIndex); comp = renderer.getTableCellRendererComponent(table, table.getValueAt(r, vColIndex), false, false, r, vColIndex); width = Math.max(width, comp.getPreferredSize().width); } // Add margin width += 2 * margin; // Set the width col.setPreferredWidth(width); } ((DefaultTableCellRenderer) table.getTableHeader().getDefaultRenderer()).setHorizontalAlignment( SwingConstants.LEFT); // table.setAutoCreateRowSorter(true); table.getTableHeader().setReorderingAllowed(false); return table; } |
Example:
1 2 3 | // Must pass the model DefaultTableModel model = new DefaultTableModel(); jTable = autoResizeColWidth(jTable, model); |
Tested on JRE v5 and JRE v6
Hi,
I would like try your code. But I an not able because I don’t find the DefaultTableColour class ad code go on error naturally. I find it in all java package , bun don’t find it. Could you tell me where is it? Thanks
Enzo
enzo
23 Jul 09 at 02:55 PM
@enzo
Oops.. sorry about that, it was my custom class for colouring the table cells and has nothing to do with auto resizing the table, I’ve removed it. Please try it again, good luck :)
amree
23 Jul 09 at 06:47 PM
Fantastics. Now it’s working very well!!!!
Thanks Enzo
—-
A little advice: it’s very difficult read your captcha, because foreground and background colour are similar!!
enzo
25 Jul 09 at 01:57 AM
@enzo
I had lots of spam before, that’s why I use that captcha, maybe I’ll change to something else, but thanks for the advice :D
amree
25 Jul 09 at 10:39 PM
Seriously, you rock dude!!!
Been looking for something like this for a while :D
Will
8 Sep 09 at 11:22 PM
I think you need to convert view column index to model column index in line 10.
chutan
16 Sep 09 at 03:10 AM
Good stuff. Thanks.
mazais
22 Sep 09 at 05:36 AM
Thanks! Just exactly what I needed.
Phil
29 Oct 09 at 08:32 AM
Great my friend, just what I was looking for. Thanks.
JCarlos
12 Nov 09 at 06:45 AM
Works for me. Thanks!
Rob
11 Jan 10 at 11:01 AM
Hi,
it doesn’t work for me… I copied your method and call it like this:
1) JTable jtable = new JTable(data, columnNames); //my data and my columnNames
2) DefaultTableModel model = new DefaultTableModel();
3) jtable = autoResizeColWidth(jtable, model);
When I leave out your code, my jtable is displayed with correct content but without enough cell width for the data. When I use your method as stated above, there’s no more table content (neither header nor data).
I would be happy if someone could help me
Luke
Luke
2 Sep 10 at 12:19 AM
Does the ‘data’ refers to your DefaultTableModel? If it is, then you don’t have to recreate another model, just put your model in the autoResizeColWidth(). The ‘model’ should be your own data which is a DefaultTableModel type, not mine.
amree
2 Sep 10 at 01:04 AM