使用Timer类的两个实例 动态时钟

 1 package chapter16;
 2
 3 import javax.swing.*;
 4 import chapter15.StillClock;
 5 import java.awt.event.*;
 6
 7 public class ClockAnimation extends JFrame {
 8     public class TimerListener implements ActionListener {
 9         @Override
10         public void actionPerformed(ActionEvent e) {
11             // TODO Auto-generated method stub
12             clock.setCurrentTime();
13             clock.repaint();
14         }
15     }
16     private StillClock clock=new StillClock();
17     public ClockAnimation(){
18         add(clock);
19         Timer timer=new Timer(1000,new TimerListener());
20         timer.start();
21     }
22     public static void main(String[] args) {
23         // TODO Auto-generated method stub
24         ClockAnimation frame=new ClockAnimation();
25         frame.setTitle("ClockAnimation");
26         frame.setSize(200,200);
27         frame.setLocationRelativeTo(null);
28         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
29         frame.setVisible(true);
30
31     }
32
33 }

第一个实例是动态时钟，其中StillClock是静态时钟的类。

 1 package chapter16;
 2 import javax.swing.*;
 3 import java.awt.*;
 4 import java.awt.event.*;
 5
 6 public class AnimationDemo extends JFrame {
 7     public AnimationDemo(){
 8         add(new MovingMessagePanel("message moving?"));
 9     }
10     public static class MovingMessagePanel extends JPanel {
11
12         public class TimerListener implements ActionListener {
13             @Override
14             public void actionPerformed(ActionEvent e) {
15                 // TODO Auto-generated method stub
16                 repaint();
17             }
18         }
19         private String message="Welcome to Java";
20         private int xCoordinate=0;
21         private int yCoordinate=30;
22
23         public MovingMessagePanel(String message){
24             this.message=message;
25             Timer timer=new Timer(500,new TimerListener());
26             timer.start();
27         }
28         protected void paintComponent(Graphics g){
29             super.paintComponent(g);
30             if(xCoordinate>getWidth()){
31                 xCoordinate=-20;
32             }
33             xCoordinate+=5;
34             g.drawString(message, xCoordinate, yCoordinate);
35         }
36     }
37     public static void main(String[] args) {
38         // TODO Auto-generated method stub
39         AnimationDemo frame=new AnimationDemo();
40         frame.setTitle("AnimationDemo");
41         frame.setSize(300,100);
42         frame.setLocationRelativeTo(null);
43         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
44         frame.setVisible(true);
45
46     }
47
48 }

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。