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。