在运行JDK1。3 AWT图形程序时出现如下错误！

Question

1. /*
2. * @(#)Clock2.java        1.5 98/07/09
3. *
4. * Copyright (c) 1997, 1998 Sun Microsystems, Inc. All Rights Reserved.
5. *
6. * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
7. * modify and redistribute this software in source and binary code form,
8. * provided that i) this copyright notice and license appear on all copies of
9. * the software; and ii) Licensee does not utilize the software in a manner
10. * which is disparaging to Sun.
11. *
12. * This software is provided "AS IS," without a warranty of any kind. ALL
13. * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
14. * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
15. * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
16. * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
17. * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
18. * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
19. * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
20. * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
21. * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
22. * POSSIBILITY OF SUCH DAMAGES.
23. *
24. * This software is not designed or intended for use in on-line control of
25. * aircraft, air traffic, aircraft navigation or aircraft communications; or in
26. * the design, construction, operation or maintenance of any nuclear
27. * facility. Licensee represents and warrants that it will not use or
28. * redistribute the Software for such purposes.
29. */
31. import java.util.*;
32. import java.awt.*;
33. import java.applet.*;
34. import java.text.*;
36. /**
37. * Time!
38. *
39. * @author Rachel Gollub
40. */
42. public class Clock2 extends Applet implements Runnable {
43.     Thread timer;                // The thread that displays clock
44.     int lastxs, lastys, lastxm,
45.         lastym, lastxh, lastyh;  // Dimensions used to draw hands
46.     SimpleDateFormat formatter;  // Formats the date displayed
47.     String lastdate;             // String to hold date displayed
48.     Font clockFaceFont;          // Font for number display on clock
49.     Date currentDate;            // Used to get date to display
50.     Color handColor;             // Color of main hands and dial
51.     Color numberColor;           // Color of second hand and numbers
53.     public void init() {
54.         int x,y;
55.         lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
56.         formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy", Locale.getDefault());
57.         currentDate = new Date();
58.         lastdate = formatter.format(currentDate);
59.         clockFaceFont = new Font("Serif", Font.PLAIN, 14);
60.         handColor = Color.blue;
61.         numberColor = Color.darkGray;
63.         try {
64.             setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),16)));
65.         } catch (Exception E) { }
66.         try {
67.             handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),16));
68.         } catch (Exception E) { }
69.         try {
70.             numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),16));
71.         } catch (Exception E) { }
72.         resize(300,300);              // Set clock window size
73.     }
75.     // Plotpoints allows calculation to only cover 45 degrees of the circle,
76.     // and then mirror
77.     public void plotpoints(int x0, int y0, int x, int y, Graphics g) {
78.         g.drawLine(x0+x,y0+y,x0+x,y0+y);
79.         g.drawLine(x0+y,y0+x,x0+y,y0+x);
80.         g.drawLine(x0+y,y0-x,x0+y,y0-x);
81.         g.drawLine(x0+x,y0-y,x0+x,y0-y);
82.         g.drawLine(x0-x,y0-y,x0-x,y0-y);
83.         g.drawLine(x0-y,y0-x,x0-y,y0-x);
84.         g.drawLine(x0-y,y0+x,x0-y,y0+x);
85.         g.drawLine(x0-x,y0+y,x0-x,y0+y);
86.     }
88.     // Circle is just Bresenham's algorithm for a scan converted circle
89.     public void circle(int x0, int y0, int r, Graphics g) {
90.         int x,y;
91.         float d;
92.         x=0;
93.         y=r;
94.         d=5/4-r;
95.         plotpoints(x0,y0,x,y,g);
97.         while (y>x){
98.             if (d<0) {
99.                 d=d+2*x+3;
100.                 x++;
101.             }
102.             else {
103.                 d=d+2*(x-y)+5;
104.                 x++;
105.                 y--;
106.             }
107.             plotpoints(x0,y0,x,y,g);
108.         }
109.     }
111.     // Paint is the main part of the program
112.     public void paint(Graphics g) {
113.         int xh, yh, xm, ym, xs, ys, s = 0, m = 10, h = 10, xcenter, ycenter;
114.         String today;
116.         currentDate = new Date();
117.         SimpleDateFormat formatter = new SimpleDateFormat("s",Locale.getDefault());
118.         try {
119.             s = Integer.parseInt(formatter.format(currentDate));
120.         } catch (NumberFormatException n) {
121.             s = 0;
122.         }
123.         formatter.applyPattern("m");
124.         try {
125.             m = Integer.parseInt(formatter.format(currentDate));
126.         } catch (NumberFormatException n) {
127.             m = 10;
128.         }   
129.         formatter.applyPattern("h");
130.         try {
131.             h = Integer.parseInt(formatter.format(currentDate));
132.         } catch (NumberFormatException n) {
133.             h = 10;
134.         }
135.         formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
136.         today = formatter.format(currentDate);
137.         xcenter=80;
138.         ycenter=55;
139.    
140.     // a= s* pi/2 - pi/2 (to switch 0,0 from 3:00 to 12:00)
141.     // x = r(cos a) + xcenter, y = r(sin a) + ycenter
142.    
143.         xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 45 + xcenter);
144.         ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 45 + ycenter);
145.         xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 40 + xcenter);
146.         ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 40 + ycenter);
147.         xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + xcenter);
148.         yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + ycenter);
149.    
150.     // Draw the circle and numbers
151.    
152.         g.setFont(clockFaceFont);
153.         g.setColor(handColor);
154.         circle(xcenter,ycenter,50,g);
155.         g.setColor(numberColor);
156.         g.drawString("9",xcenter-45,ycenter+3);
157.         g.drawString("3",xcenter+40,ycenter+3);
158.         g.drawString("12",xcenter-5,ycenter-37);
159.         g.drawString("6",xcenter-3,ycenter+45);
161.     // Erase if necessary, and redraw
162.    
163.         g.setColor(getBackground());
164.         if (xs != lastxs || ys != lastys) {
165.             g.drawLine(xcenter, ycenter, lastxs, lastys);
166.             g.drawString(lastdate, 5, 125);
167.         }
168.         if (xm != lastxm || ym != lastym) {
169.             g.drawLine(xcenter, ycenter-1, lastxm, lastym);
170.             g.drawLine(xcenter-1, ycenter, lastxm, lastym); }
171.         if (xh != lastxh || yh != lastyh) {
172.             g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
173.             g.drawLine(xcenter-1, ycenter, lastxh, lastyh); }
174.         g.setColor(numberColor);
175.         g.drawString("", 5, 125);
176.         g.drawString(today, 5, 125);   
177.         g.drawLine(xcenter, ycenter, xs, ys);
178.         g.setColor(handColor);
179.         g.drawLine(xcenter, ycenter-1, xm, ym);
180.         g.drawLine(xcenter-1, ycenter, xm, ym);
181.         g.drawLine(xcenter, ycenter-1, xh, yh);
182.         g.drawLine(xcenter-1, ycenter, xh, yh);
183.         lastxs=xs; lastys=ys;
184.         lastxm=xm; lastym=ym;
185.         lastxh=xh; lastyh=yh;
186.         lastdate = today;
187.         currentDate=null;
188.     }
190.     public void start() {
191.         timer = new Thread(this);
192.         timer.start();
193.     }
195.     public void stop() {
196.         timer = null;
197.     }
199.     public void run() {
200.         Thread me = Thread.currentThread();
201.         while (timer == me) {
202.             try {
203.                 Thread.currentThread().sleep(100);
204.             } catch (InterruptedException e) {
205.             }
206.             repaint();
207.         }
208.     }
210.     public void update(Graphics g) {
211.         paint(g);
212.     }
214.     public String getAppletInfo() {
215.         return "Title: A Clock \nAuthor: Rachel Gollub, 1995 \nAn analog clock.";
216.     }
217.   
218.     public String[][] getParameterInfo() {
219.         String[][] info = {
220.             {"bgcolor", "hexadecimal RGB number", "The background color. Default is the color of your browser."},
221.             {"fgcolor1", "hexadecimal RGB number", "The color of the hands and dial. Default is blue."},
222.             {"fgcolor2", "hexadecimal RGB number", "The color of the seconds hand and numbers. Default is dark gray."}
223.         };
224.         return info;
225.     }
227. }

复制代码Exdception in thread "main" java.lang.NoSuchMethodError:main
请问如何解决？

Answer 1

applet早已是一种不再使用的技术

Answer 2

applet你要嵌在浏览器中执行

Answer 3

那JAVA能直接写UNIX界面吗，用SWING行吗？

Answer 4

回复 4# xzh2002

    请问，你说的UNIX界面是啥？
如果UNIX上java不能写图形界面，跨平台白叫了。

既然lz把贴发到了这个版，不如试试gtk的java绑定。

Answer 5

GTK已经实验过了，很好用的