Custom ListCellRenderer will not change background color

Question

I have this class:

 @SuppressWarnings(\"serial\")
  private class DataCellRenderer extends JLabel implements ListCellRenderer 
  {
    public DataCellRender         


        

Answer 1

The main problem is that labels are non-opaque by default, so you need to make the label opaque in order for the background to be painted.

But you don't need to create a custom renderer for this. The default renderer is opaque. All you need to do is set the selection background property of the list:

list.setSelectionBackground(Color.RED);

If you are trying to create a renderer to right align the text then you can just set a property on the default renderer:

DefaultListCellRenderer renderer = (DefaultListCellRenderer)list.getCellRenderer();
renderer.setHorizontalAlignment(SwingConstants.RIGHT);