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:

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(...);

Answer 3

I actually run into this problem too. I've found one useful link that solved my issue. Pretty much get the specific column and set its setMinWidth and setMaxWidth to be the same(as fixed.)

private void fixWidth(final JTable table, final int columnIndex, final int width) {
    TableColumn column = table.getColumnModel().getColumn(columnIndex);
    column.setMinWidth(width);
    column.setMaxWidth(width);
    column.setPreferredWidth(width);
}

Ref: https://forums.oracle.com/thread/1353172