JTable Right Align Header

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 colu

Answer 1

I have created a class based on the solution of pvbemmelen62, that can be used very easily, for example:

AlignHeaderRenderer.install(myTable, new int[] { SwingConstants.RIGHT,
                        SwingConstants.RIGHT, SwingConstants.LEFT });

or

AlignHeaderRenderer.install(myTable, 0, SwingConstants.RIGHT);
AlignHeaderRenderer.install(myTable, 1, SwingConstants.RIGHT);

Here's the code:

public class AlignHeaderRenderer implements TableCellRenderer {

private final TableCellRenderer renderer;
private final int alignment;

public static void install(final JTable table, final int[] alignments) {
    for (int i = 0; i < alignments.length; ++i)
        install(table, i, alignments[i]);
}

public static void install(final JTable table, final int row,
        final int alignment) {
    table.getTableHeader().getColumnModel().getColumn(row)
            .setHeaderRenderer(new AlignHeaderRenderer(table, alignment));
}

private AlignHeaderRenderer(final JTable table, final int alignment) {
    renderer = table.getTableHeader().getDefaultRenderer();
    this.alignment = alignment;
}

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

}