java 使用ActionListener监控

 1 package test;
 2 
 3 import java.awt.Font;
 4 import java.awt.GridLayout;
 5 import java.awt.LayoutManager;
 6 import java.awt.event.ActionEvent;
 7 import java.awt.event.ActionListener;
 8 import java.awt.event.WindowAdapter;
 9 import java.awt.event.WindowEvent;
10 //import java.util.EmptyStackException;
11 
12 import javax.swing.JButton;
13 import javax.swing.JFrame;
14 import javax.swing.JLabel;
15 import javax.swing.JPanel;
16 import javax.swing.JScrollPane;
17 import javax.swing.JTextArea;
18 import javax.swing.JTextField;
19 
20 class ActionHandle{
21     private JFrame f=new JFrame("Welcome to use Login!");
22     private JButton but=new JButton("显示");
23     private JLabel lab=new JLabel();
24     private JTextField text=new JTextField(10);
25     private JPanel pan=new JPanel();
26     public ActionHandle(){
27         Font fnt=new Font("Serief",Font.ITALIC+Font.BOLD,28);
28         lab.setFont(fnt);
29         lab.setText("等待用户输入信息！");
30         but.addActionListener(new ActionListener() {
31             public void actionPerformed(ActionEvent e) {
32                 if(arg0.getSource()==but){
33                     lab.setText(text.getText());
34                 }
35             }
36         });
37         f.addWindowListener(new WindowAdapter() {
38             public void windowClosing(WindowEvent arg0){
39                 System.exit(1);
40             }
41         });
42         f.setLayout(new GridLayout(2,1));
43         pan.setLayout(new GridLayout(1,2));
44         pan.add(text);
45         pan.add(but);
46         f.add(pan);
47         f.add(lab);
48         f.pack();
49         f.setVisible(true);
50     }
51 }
52 public class test {
53     public static void main(String[] args) {
54         
55         new ActionHandle();
56     }
57 
58 }