Java Swing简单的加法器

 1 package test;
 2 import java.awt.*;
 3 import javax.swing.*;
 4 import java.awt.event.*;
 5 public class FrameDemo2
 6 {
 7 static JTextField field1=new JTextField(5);
 8 static JTextField field2=new JTextField(5);
 9 static JTextField field3=new JTextField("0",5);
10 
11 public FrameDemo2(){
12     JFrame f=new JFrame("加法器");
13     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
14     f.setSize(220,100);
15     f.setLocation(500,300);
16     JLabel jb=new JLabel("+");
17     f.setVisible(true);
18     JPanel p1=new JPanel();
19     f.setContentPane(p1);
20     p1.setLayout(new FlowLayout());
21 
22     p1.add(field1);
23     p1.add(jb);
24     p1.add(field2);
25     p1.add(field3);
26     JButton b1=new JButton("计算");
27     Color bg=new Color(255,255,255);
28     b1.setBackground(bg); 
29     p1.add(b1);
30 
31     b1.addActionListener(new ActionListener()
32     {
33     public void actionPerformed(ActionEvent e)    //重写actionPerformed方法
34     {
35     int a,b;
36     a=Integer.parseInt(field1.getText()); //获取TextField1中的数据
37     b=Integer.parseInt(field2.getText());
38     field3.setText(String.valueOf(a+b));
39     }
40     }
41     );
42 }
43 public static void main(String args[])
44 {
45     FrameDemo2 fd=new FrameDemo2();
46 }
47 }