Question

Basically, I have a JTable containing columns with right-aligned cells but left-aligned headers which looks really bad. I would like to right-align the headers of these columns without altering the “Look and Feel” of the headers.

Thanks

Answer 1

Here’s an alternate approach to modifying the TableCellRenderer of a table’s JTableHeader. It’s not strictly necessary for this usage, but it minimizes the impact on the UI delegate’s appearance.

Typical usage:

JTable table = new JTable(…);
JTableHeader header = table.getTableHeader();
header.setDefaultRenderer(new HeaderRenderer(table));

Custom header renderer:

private static class HeaderRenderer implements TableCellRenderer {

    DefaultTableCellRenderer renderer;

    public HeaderRenderer(JTable table) {
        renderer = (DefaultTableCellRenderer)
            table.getTableHeader().getDefaultRenderer();
        renderer.setHorizontalAlignment(JLabel.CENTER);
    }

    @Override
    public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected,
        boolean hasFocus, int row, int col) {
        return renderer.getTableCellRendererComponent(
            table, value, isSelected, hasFocus, row, col);
    }
}