Java Swing - 如何以红色为JList突出显示特定单元格

import java.awt.Color;
import java.awt.Component;

import javax.swing.DefaultListCellRenderer;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;

public class Main {
  public static void main(String[] args) {
    Integer[] nums = { 10, 2, 5, 8, 2, 9, 2, 8, 10, 4, 6 };
    JList<Integer> list = new JList(nums);
    list.setCellRenderer(new DefaultListCellRenderer() {
      public Component getListCellRendererComponent(JList list, Object value,
          int index, boolean isSelected, boolean cellHasFocus) {
        super.getListCellRendererComponent(list, value, index, isSelected,
            cellHasFocus);
        Integer num = (Integer) value;
        if (num < 5) {
          setBackground(Color.RED);
        }
        return this;
      }
    });
    JOptionPane.showMessageDialog(null, new JScrollPane(list));
  }
}