Java第七次上机（窗口）

 1 package Person;
 2 import javax.swing.*;
 3 import java.awt.*;
 4 import java.awt.event.ActionEvent;
 5 import java.awt.event.ActionListener;
 6 
 7 public class Calculator {
 8         JFrame f;
 9         JPanel p;
10         JButton [] b;
11         String[] title = {"7","8","9","/",
12                         "4","5","6","*",
13                         "1","2","3","-",
14                         "0","c","=","+"};
15         JTextField t;
16 
17     public Calculator(){
18         f = new JFrame("计算器");
19         p = new JPanel();
20         t = new JTextField();
21         b = new JButton[16];
22         
23         f.setVisible(true);
24         f.setLocationRelativeTo(null); 
25         f.setSize(450,450);
26         f.add(t,BorderLayout.NORTH);
27         t.setPreferredSize(new Dimension(15,50));        //设置文本框长、宽
28         p.setLayout(new GridLayout(4,4));
29         f.add(p,BorderLayout.CENTER);
30         for(int i=0;i<16;i++){
31             b[i] = new JButton(title[i]);
32             p.add(b[i]);
33         }
34         
35 }
36     public static void main(String args[]){
37         new Calculator();
38     }
39 }