Automatically adjust Jtable Column to fit content

Question

I am trying to match the JTable column width depending on the data inside. My Code:

    for(int column = 0; column < gui.testsuiteInfoTable.getColumnCount(); column ++){
        int  width =0;
    for (int row = 0; row < gui.testsuiteInfoTable.getRowCount(); row++) {
         TableCellRenderer renderer = gui.testsuiteInfoTable.getCellRenderer(row, column);
         Component comp = gui.testsuiteInfoTable.prepareRenderer(renderer, row, column);
         width = Math.max (comp.getPreferredSize().width, width);
         System.out.println(width);
     }
    TableColumn col = new TableColumn();
    col = gui.testsuiteInfoTable.getColumnModel().getColumn(column);
    System.out.println(width);
    col.setWidth(width);
    gui.testsuiteInfoTable.revalidate();

    }
}

The sizes are correct I guess but the table columns still all have the same width! The table is embedded in a ScrollPane in a GridBagLayout is that the problem? Thanks for any suggestions.

Look at [link](http://tips4java.wordpress.com/2008/11/10/table-column-adjuster/) — Jannis Alexakis, Jul 25 '13 at 12:41

score 25 · Answer 1 · answered Aug 29 '14 at 14:51

This is all you need:

JTable table = new JTable(){
    @Override
       public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
           Component component = super.prepareRenderer(renderer, row, column);
           int rendererWidth = component.getPreferredSize().width;
           TableColumn tableColumn = getColumnModel().getColumn(column);
           tableColumn.setPreferredWidth(Math.max(rendererWidth + getIntercellSpacing().width, tableColumn.getPreferredWidth()));
           return component;
        }
    };
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

The table will adjust each column width automatically to fit the content. There's no need to control when to trigger the resizing.

That'll works, but you'll get a warning asking for serialVersionUID if you don't add it. +1. — Jean-François Savard, Nov 01 '15 at 17:42
It looks like once the table column gets resized to a larger value, it doesn't shrink back down to fit the current state of columns. — lordoku, Oct 12 '16 at 17:51

score 12 · Accepted Answer · answered Jul 25 '13 at 14:04

12

If you can use an extra library, try Swingx (https://java.net/projects/swingx) There you have a JXTable, with a method "packAll()", that does exactly what you are asking for

answered Jul 25 '13 at 14:04

chipukb

213
3
7

score 6 · Answer 3 · answered Jul 25 '13 at 14:44

6

col.setWidth(width);

Read the JTable API and follow the link on How to Use Tables. In that tutorial they use the setPreferredWidth(...) to suggest a width for a column.

You may also want to check out the Table Column Adjuster which does this for you. This solution can also take into account the width of the column header.

answered Jul 25 '13 at 14:44

camickr

321,443
19
166
288

1

Thank you. The problem seems to be if you don´t add the JTable to a JScrollPane, then setWidth etc. does not work. – Hans En Jul 29 '13 at 08:48

Automatically adjust Jtable Column to fit content

3 Answers3

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