test.java

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class Test extends JApplet {
	public void init() {
		Container contentPane = getContentPane();
		JComboBox combo = new JComboBox(new Object[] {
			new Object[] { Color.gray, "gray" },
			new Object[] { Color.orange, "orange" },
			new Object[] { Color.red, "red" },
			new Object[] { Color.blue, "blue" },
			new Object[] { Color.yellow, "yellow" },
			new Object[] { Color.magenta, "magenta" },
			new Object[] { Color.black, "black" },
			new Object[] { Color.green, "green" },
			new Object[] { Color.lightGray, "lightGray"} });

		combo.setRenderer(new ColorRenderer());

		contentPane.setLayout(new FlowLayout());
		contentPane.add(combo);
	}
}
class ColorRenderer extends JLabel implements ListCellRenderer {
	private static ColorIcon icon = new ColorIcon();

	private Border 
		redBorder = BorderFactory.createLineBorder(Color.red,2),
		emptyBorder = BorderFactory.createEmptyBorder(2,2,2,2);

	public Component getListCellRendererComponent(
									JList list,
									Object value,
									int index,
									boolean isSelected,
									boolean cellHasFocus) {
		Object[] array = (Object[])value;

		icon.setColor((Color)array[0]);
		setIcon(icon);
		setText((String)array[1]);

		if(isSelected) setBorder(redBorder);
		else 		   setBorder(emptyBorder);

		return this;
	}
}
class ColorIcon implements Icon {
	private Color color;
	private int w, h;

	public ColorIcon() {
		this(Color.gray, 50, 15);
	}
	public ColorIcon(Color color, int w, int h) {
		this.color = color;
		this.w = w;
		this.h = h;
	}
	public void paintIcon(Component c, Graphics g, int x, int y) {
		g.setColor(Color.black);
		g.drawRect(x, y, w-1, h-1);
		g.setColor(color);
		g.fillRect(x+1, y+1, w-2, h-2);
	}
	public Color getColor() {
		return color;
	}
	public void setColor(Color color) {
		this.color = color;
	}
	public int getIconWidth() {
		return w;
	}
	public int getIconHeight() {
		return h;
	}
}