test.java

来自「这个程序实现了在网络上截获邮件数据并还原邮件。仅供学习参考」· Java 代码 · 共 31 行

import  javax.swing.*;  
import  java.awt.*;  
import  java.awt.event.*;  
import  java.awt.event.ActionEvent;  
 
class  Test  {  
   JFrame  frame;  
   JButton  button;  
   Font  font;  
 
   public  Test(){  
       font  =  new  Font("宋体",0,12);  
       UIManager.put("Button.font",font);  
       UIManager.put("Label.font",font);  
       frame  =  new  JFrame("Test");  
       button  =  new  JButton("弹出");  
       button.addActionListener(new  ActionListener()  {  
           public  void  actionPerformed(ActionEvent  actionEvent)  {  
               JLabel  l  =  new  JLabel("用户名或密码错误\n请重新输入");  
               JOptionPane.showMessageDialog(frame,l,"错误",JOptionPane.ERROR_MESSAGE);  
           }  
       });  
       frame.getContentPane().add(button);  
       frame.setSize(300,  200);  
       frame.setVisible(true);  
   }  
   public  static  void  main(String[]  args)  {  
       new  Test();  
   }  
}