1 import java.awt.*;
 2 import java.awt.geom.AffineTransform;
 3 import java.util.Calendar;
 4 import javax.swing.JFrame;
 5 import javax.swing.JPanel;
 6 //@Author:M-Y
 7 //@Time:2016/12/1
 8 public class time extends JFrame{
 9     public time(){
10         JPanel panel=new JPanel();
11         panel.setLayout(new GridLayout());
12         Clock1 c=new Clock1();
13         panel.add(c);
14         this.add(panel);
15     }
16     public static void main(String[] args) {
17         time t=new time();
18         t.setSize(300,300); //窗口大小
19         t.setTitle("Clock");//窗口名
20         t.setVisible(true); //设置为可见
21         t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
22     }
23 }
24 class Clock1 extends JPanel{
25     Thread th;
26     public void run(){
27         while(true){
28             try{
29                 repaint();
30             }catch(Exception e){}
31         }
32     }
33     public void paint(Graphics g){
34         Graphics2D g2d=(Graphics2D)g;
35         //去掉锯齿  
36         g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);  
37         //清空原来的图形  
38         g2d.setColor(Color.white);  
39         g2d.fillRect(0,0,this.getWidth(),this.getHeight()); 
40         g2d.setColor(Color.black);
41         //圆心(x,y)  半径radius=100
42         int x0=150;
43         int y0=150;
44         int radius=100;
45         g2d.drawOval(50,50,200,200);
46         g2d.drawOval(48,48,204,204);
47         //画刻度
48          for(int i=0;i<60;i++){    
49                g2d.fillRect(x0-2,46,3,3);   
50                g2d.rotate(Math.toRadians(6),x0,y0);    
51            }
52         //画12个数字
53          for(int i=0;i<12;i++){    
54                 double d=Math.PI/180*i*(360/12); //每次转360/12度    
55                 int x=(x0-4)+(int)((radius-12)*Math.cos(d));    
56                 int y=(y0+4)+(int)((radius-12)*Math.sin(d));    
57                 //因为是从顺时钟3点钟开始画，所以索引i需要加上3    
58                 int j=i+3;    
59                 if(j>12)    
60                 j=j-12;    
61                 g2d.drawString(Integer.toString(j),x,y);                  
62          }
63         //设置旋转重置 
64          AffineTransform old=g2d.getTransform(); 
65          g2d.setTransform(old);  
66          Calendar c=Calendar.getInstance();   
67          int h=c.get(Calendar.HOUR_OF_DAY); //得到hour ----时
68          int m=c.get(Calendar.MINUTE);      //得到minute---分
69          int s=c.get(Calendar.SECOND);      //得到second---秒
70          //画时针 
71          double hAngle=(h-12+m/60d)*360d/12d;
72          g2d.rotate(Math.toRadians(hAngle),x0,y0);   
73          g.drawLine(x0,y0,x0,100);
74          //画分针
75          double mAngle=(m+s/60d)*360d/60d;
76          g2d.rotate(Math.toRadians(mAngle),x0,y0);   
77          g.drawLine(x0,y0,x0,70);
78          //画秒针
79          double sAngle=s*360d/60d;  
80          g2d.rotate(Math.toRadians(sAngle),x0,y0);   
81          g.drawLine(x0,y0,x0,55);  
82          repaint();
83     }
84 }