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Java Swing - 如何使用Model来同步JList和JComboBox

jlist 【jlist】
我们想知道如何使用Model来同步JList和JComboBox。
代码展示 运行结果 
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.Timer;

public class Main {
  public static void main(String[] args) {
    int TIMER_DELAY = 2000;
    String[] data = { "A", "B", "C", "D" };

    DefaultComboBoxModel<String> model = new DefaultComboBoxModel<>(data);

    JComboBox<String> combobox = new JComboBox<>(model);
    JList<String> jlist = new JList<>(model);

    new Timer(TIMER_DELAY, new ActionListener() {
      private int count = 0;
      public void actionPerformed(ActionEvent e) {
        model.addElement("count: " + count);
        count++;
      }
    }).start();

    JPanel comboPanel = new JPanel();
    comboPanel.add(combobox);

    JPanel listPanel = new JPanel();
    listPanel.add(new JScrollPane(jlist));

    JPanel panel = new JPanel(new GridLayout(1, 0));
    panel.add(comboPanel);
    panel.add(listPanel);
    panel.setPreferredSize(new Dimension(400, 200));

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(panel);
    f.pack();
    f.setVisible(true);
  }
}