1. import java.awt.*;
   
2. import java.applet.*;
   
3. import java.awt.event.*;
   
4. import javax.swing.*;
   
5. public class Calculator1 extends Frame  
   
6. { private static String[] KEYS={"0","1","2","3",
   
7. "4","5","6","7",
   
8. "8","9","+","-",
   
9. "*","/","=","%"};
   
10.   
    
11.   
    
12. private Panel keys;
    
13. private Panel text;  
    
14. public Calculator1(String title)
    
15. {super(title);
    
16. setSize(200,200);
    
17. setLocation(100,100);
    
18. setKeys();  
    
19. setText();
    
20. setLayout(new BorderLayout(3,3));  
    
21. add(keys,BorderLayout.CENTER);
    
22. add(text,BorderLayout.NORTH );
    
23. addWindowListener(new WindowAdapter()
    
24. {
    
25. public void windowClosing(WindowEvent e)
    
26. {
    
27. System.exit(0);
    
28. }
    
29. });  
    
30. }
    
31. public void setKeys()
    
32. {
    
33. Panel keys=new Panel();
    
34. keys.setLayout(new GridLayout(4,4,3,3));
    
35. for(int i=0;i<KEYS.length;i++)
    
36. {  
    
37.   keys.add(new JButton(KEYS[i]));
    
38.   
    
39. }
    
40. }  
    
41. public void setText()
    
42. {  
    
43. Panel text=new Panel();
    
44. TextField f=new TextField(25);  
    
45. text.add(f);  
    
46. }
    
47.   
    
48. public static void main(String[] args) throws HeadlessException  
    
49. { Calculator1 f=new Calculator1("计算器");
    
50.   
    
51. f.pack();  
    
52. f.show();  
    
53. }  
    
54. 
    
55. }

复制代码

高手，顶一个！

33,43行,你又重新定义了一个Panel
改成
keys=new Panel();
text=new Panel();
就OK了

顺便说一句,你的f.show();
应该改成f.setVisible(true);
计算器很好看，不错啊！我还没编过GUI的程序，有机会自己设计一下看看