loginjapplet.java

《Java2程序设计实用教程(第2版)》课件

//【例8.2】  Applet中的邮箱登录界面。

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import javax.swing.*;

public class LoginJApplet extends JApplet implements ActionListener
{
    private JTextField text_user;                          //用户名文本行
    private JPasswordField password;                       //口令文本行
    private JComboBox combobox_mailbox;                    //邮箱组合框
    private JButton button_login;                          //登录按钮      

    public void init()                                     //初始化Applet
    {
        this.setBackground(Color.white);                   //设置背景颜色
        this.setLayout(new FlowLayout(FlowLayout.LEFT));   //行布局
        
        this.add(new JLabel("邮箱"));
        text_user = new JTextField("用户名",10);
        text_user.addActionListener(this);                 //为文本行注册单击事件监听器
        this.add(text_user);

        this.add(new JLabel("@"));
        Object box[]={"263.net", "x263.net"};
        combobox_mailbox = new JComboBox(box);
        this.add(combobox_mailbox);

        this.add(new JLabel("密码"));
        password = new JPasswordField("******",10);
        this.add(password);

        button_login = new JButton("登录"); 
        this.add(button_login);
        button_login.addActionListener(this);              //为按钮注册单击事件监听器
    }
    
    public void actionPerformed(ActionEvent e)             //单击按钮或文本行中单击Enter键时
    {
        if ((e.getSource()==button_login) || (e.getSource()==password))
        {}
    }
}