Auto resize the widths of JTable's columns dynamically

Question

I have a JTable with 3 columns:

- No. #
- Name
- PhoneNumber

I want to make specific width for each column as follows:

and I want the JTable able to update the widths of its columns dynamically if needed (for example, inserting large number in the column #) and keeping same style of the JTable

I solved the first issue, using this code:

myTable.getColumnModel().getColumn(columnNumber).setPreferredWidth(columnWidth);

but I didn't success to make myTable to update the widths dynamically ONLY if the current width of the column doesn't fit its contents. Can you help me solving this issue?

Answer 1

Here I found my answer: http://tips4java.wordpress.com/2008/11/10/table-column-adjuster/
The idea is to check some rows' content length to adjust the column width.
In the article, the author provided a full code in a downloadable java file.

JTable table = new JTable( ... );
table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );

for (int column = 0; column < table.getColumnCount(); column++)
{
    TableColumn tableColumn = table.getColumnModel().getColumn(column);
    int preferredWidth = tableColumn.getMinWidth();
    int maxWidth = tableColumn.getMaxWidth();

    for (int row = 0; row < table.getRowCount(); row++)
    {
        TableCellRenderer cellRenderer = table.getCellRenderer(row, column);
        Component c = table.prepareRenderer(cellRenderer, row, column);
        int width = c.getPreferredSize().width + table.getIntercellSpacing().width;
        preferredWidth = Math.max(preferredWidth, width);

        //  We've exceeded the maximum width, no need to check other rows

        if (preferredWidth >= maxWidth)
        {
            preferredWidth = maxWidth;
            break;
        }
    }

    tableColumn.setPreferredWidth( preferredWidth );
}

Answer 2

Use the addRow(...) method of the DefaultTableModel to add data to the table dynamically.

Update:

To adjust the width of a visible column I think you need to use:

tableColumn.setWidth(...);