使用Timer类的两个实例 动态时钟

package chapter16;

import javax.swing.*;
import chapter15.StillClock;
import java.awt.event.*;

public class ClockAnimation extends JFrame {
    public class TimerListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
            clock.setCurrentTime();
            clock.repaint();
        }
    }
    private StillClock clock=new StillClock();
    public ClockAnimation(){
        add(clock);
        Timer timer=new Timer(1000,new TimerListener());
        timer.start();
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ClockAnimation frame=new ClockAnimation();
        frame.setTitle("ClockAnimation");
        frame.setSize(200,200);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

    }

}

第一个实例是动态时钟，其中StillClock是静态时钟的类。

package chapter16;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class AnimationDemo extends JFrame {
    public AnimationDemo(){
        add(new MovingMessagePanel("message moving?"));
    }
    public static class MovingMessagePanel extends JPanel {
        
        public class TimerListener implements ActionListener {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                repaint();
            }
        }
        private String message="Welcome to Java";
        private int xCoordinate=0;
        private int yCoordinate=30;
        
        public MovingMessagePanel(String message){
            this.message=message;
            Timer timer=new Timer(500,new TimerListener());
            timer.start();
        }
        protected void paintComponent(Graphics g){
            super.paintComponent(g);
            if(xCoordinate>getWidth()){
                xCoordinate=-20;
            }
            xCoordinate+=5;
            g.drawString(message, xCoordinate, yCoordinate);
        }    
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        AnimationDemo frame=new AnimationDemo();
        frame.setTitle("AnimationDemo");
        frame.setSize(300,100);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

    }

}

第二个实例是一个可以横向移动的字符串。

两个实例都是采用了Timer类。

不同的地方在于，一个TimerListener定义在JFrame也就是外层框架中，一个TimerListener定义在内层，JPanel中。目前还分不清楚这两种情况应该如何应用？

等后面只是丰富来再来解决。