JTable X System_Look-And-Feel Interaction

Question

Friends,
I'm developing an application that is centered around a JTable. The column header labels are centered and have a yellow background.
When I use the Metal look-and-feel, no problem. However, if I switch to the system look-and-feel, the column labels will no longer be centered, and their yellow background does not show up.
I've attached some code below that will duplicate this problem. Just un-remark one look-and-feel (line 16), and then the other (line 18), and see how this affects the JTable's header.
I've searched a lot of documentation, tutorials, and forums and have not seen a reference to this problem. I hope that you can help.
Thank you.
Victor
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
public class testLNF {
public static void main(String[] args) {
// set look-and-feel to the local system:
String systemLookAndFeel = UIManager.getSystemLookAndFeelClassName();
System.out.println(systemLookAndFeel);
try {
// include this for Metal Look-And-Feel
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
// include this line for System Look-And-Feel
//UIManager.setLookAndFeel(systemLookAndFeel);
} catch (Exception e) {
System.out.println("Exception: " + e);
// Display the simple JTable
tempFrame ff = new tempFrame();
ff.setSize(300, 150);
ff.setLocationRelativeTo(null);
ff.setVisible(true);
ff.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} // main
private static class tempFrame extends JFrame {
private tempFrame() {
// Create a simple JTable to work with
JTable t = new JTable(4, 4);
t.getTableHeader().setBackground(Color.YELLOW);
t.getTableHeader().setForeground(Color.BLACK);
t.getTableHeader().setOpaque(true);
t.setShowGrid(true);
t.setGridColor(Color.DARK_GRAY);
// Add it to a JScrollPane
JScrollPane s = new JScrollPane(t);
add(s);
} // class tempFrame
} // class testLNF

Answer 1

Thank you for your guidance on this issue. I've started work with cell renderers in this table -- I'm using one to center my numbers in each cell. I'll get back to work on learning the basics.
Can you help me with what you mean by "delegate to the L&F renderer?" Can you give me an example?
Thank you!