Java Swing:如何平滑地动画/移动组件

I am trying to figure out how to animate a swing component to go from point a to point b. Here is a baby example of code which makes a red JPanel move from left to right :

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

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

public class MovingSquareExample {

    private static final JPanel square = new JPanel();
    private static int x = 20;

    public static void createAndShowGUI(){
        JFrame frame = new JFrame();
        frame.getContentPane().setLayout(null);
        frame.setSize(500,500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(square);
        square.setBounds(20,200,100,100);
        square.setBackground(Color.RED);

        Timer timer = new Timer(1000/60,new MyActionListener());
        timer.start();
        frame.setVisible(true);
    }

    public static class MyActionListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent arg0) {
            square.setLocation(x++, 200);

        }

    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run(){
                createAndShowGUI();

            }
        });


    }

}

效果很好，只是我看起来有点波涛汹涌.带有可拖动方块的类似示例的动作(请参阅 Draggable Components inJava Swing) 看起来更流畅，所以我相信应该有办法让它看起来更好.任何建议将不胜感激.