java中怎样设置一个移动的面板？

以下是课本中的例题，设置了一条移动的信息，那么，怎么把message换成panel？我想要让很多东西一起移动，所以需要让整个面板移动。

import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class AnimationDemo extends JFrame {
public AnimationDemo() {
add(new MovingMessagePanel("message moving?"));
}

public static void main(String[] args) {
AnimationDemo frame = new AnimationDemo();
frame.setTitle("AnimationDemo");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(280, 100);
frame.setVisible(true);
}

static class MovingMessagePanel extends JPanel {
private String message = "Welcome to Java";
private int xCoordinate = 0;
private int yCoordinate = 20;

public MovingMessagePanel(String massage) {
this.message = message;

Timer timer = new Timer(50, new TimerListener());
timer.start();
}

public void paintComponent(Graphics g) {
super.paintComponent(g);

if (xCoordinate > getWidth()) {
xCoordinate = -20;
}
xCoordinate +=5;
g.drawString(message, xCoordinate, yCoordinate);
}

class TimerListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
repaint();
}
}
}
}

组件在面板中移动还是面板在显示器上移动呢？？
不管怎样都可以用setLocaltion（）方法设置组建的坐标
如果是重写组建的paint()方法可以使用Graphics 中相关的绘图方法