java基础学习之消息对话款

 1 package Dome;
 2 import java.awt.event.*;
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 public class WindowMess extends JFrame implements ActionListener
 7 {
 8    JTextField inputEnglish ;
 9    JTextArea show ;
10    String regex = "[a-zZ-Z]+";
11    WindowMess()
12    {
13        inputEnglish = new JTextField(22);
14        inputEnglish.addActionListener(this);
15        show = new JTextArea();
16        add(inputEnglish,BorderLayout.NORTH);  //默认布局
17        add(show,BorderLayout.CENTER);
18        setVisible(true);
19        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
20    }
21    public void actionPerformed(ActionEvent e)
22    {
23       if(e.getSource()==inputEnglish)
24       {
25         String str=inputEnglish.getText();
26         if(str.matches(regex))
27             show.append(str+"");
28       else
29       {
30         //弹出“警告”消息对话框
31           JOptionPane.showMessageDialog(this, "8 干呀6","消息对话款",JOptionPane.WARNING_MESSAGE);
32           inputEnglish.setText(null);
33       } 
34      }
35    }
36    
37 }

 1 package Dome;
 2 
 3 public class example_1 {
 4     public static void main(String args[])
 5     {
 6         WindowMess win = new WindowMess();
 7         win.setTitle("带消息对话框的窗口");
 8         win.setBounds(80,90,200,300);
 9     }
10 }