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Java Swing - 如何在JList渲染器中显示颜色

jlist 【jlist】
我们想知道如何在JList渲染器中显示颜色。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class Main extends JFrame {
  public Main() {
    Object[] items = { Color.red, Color.green, Color.blue };
    JComboBox comboBox = new JComboBox(items);
    comboBox.setRenderer(new ColorRenderer(comboBox));
    getContentPane().add(comboBox, BorderLayout.NORTH);
    add(new JTextField(), BorderLayout.SOUTH);
  }

  public static void main(String[] args) {
    Main frame = new Main();
    frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}

class ColorRenderer extends BasicComboBoxRenderer {
  JComboBox comboBox;
  Border border;

  public ColorRenderer(JComboBox comboBox) {
    this.comboBox = comboBox;
    border = new LineBorder(Color.WHITE);
  }

  public Component getListCellRendererComponent(JList list, Object value,
      int index, boolean isSelected, boolean cellHasFocus) {
    super.getListCellRendererComponent(list, value, index, isSelected,
        cellHasFocus);
    setText(value.toString());
    if (!isSelected)
      setBackground((Color) value);
    return this;
  }
}