JAVA 第二次作业

  1 package javazuoye;
  2 import javax.swing.*;
  3 
  4 import java.awt.*;
  5 import java.awt.event.*;
  6 public class denglujiemian {
  7 
  8     public static void main(String[] args) {
  9         // TODO Auto-generated method stub
 10         LoginDialog lo = new LoginDialog();
 11         lo.setVisible(true);
 12     }
 13 
 14 }
 15 public class MainWindow extends JFrame{
 16     
 17 
 18     JLabel but1;
 19     MainWindow(){
 20         
 21         setTitle("系统登录");
 22         setBounds(400,200,300,180);
 23         setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
 24 //        setLayout(null);
 25 
 26 
 27         addWindowListener(new WindowAdapter(){
 28             public void windowClosing(WindowEvent e){
 29                 System.exit(0);
 30             }
 31         });
 32         but1 = new JLabel("登录成功！");
 33         this.add(but1);
 34     
 35     }
 36     
 37     
 38 }
 39 
 40 public class LoginDialog extends JDialog {
 41     JLabel name;
 42     JLabel a2;
 43     JComboBox a3;
 44     JPasswordField password;
 45     JButton shi;
 46     JButton fou;
 47     
 48     LoginDialog(){
 49         method1();
 50     }
 51 
 52     private void method1() {
 53         // TODO Auto-generated method stub
 54         setTitle("登录系统");
 55         setBounds(500,250,220,140);
 56         setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
 57         setLayout(null);
 58         setModal(true);
 59 //        this.setResizable(false);
 60         
 61         name = new JLabel("用户名:");
 62         name.setBounds(20,10,50,20);
 63         this.add(name);
 64         a2 = new JLabel("密码:");
 65         a2.setBounds(20,32,50,20);
 66         this.add(a2);
 67         
 68         a3 = new JComboBox();
 69         a3.addItem("huakaihualuo");
 70         a3.addItem("hellow");
 71         a3.setBounds(75,10,105,20);
 72         this.add(a3);
 73         password = new JPasswordField("666666");
 74         password.setBounds(75,33,105,20);
 75         password.setEchoChar('*');
 76         this.add(password);
 77         
 78         shi = new JButton("登录");
 79         shi.setBounds(25,60,60,20);
 80         add(shi);
 81         shi.addActionListener(new ActionListener(){
 82 
 83             @Override
 84             public void actionPerformed(ActionEvent e) {
 85                 // TODO Auto-generated method stub
 86                 login();
 87             }            
 88         });
 89         fou =new JButton("退出");
 90         fou.setBounds(110,60,60,20);
 91         add(fou);
 92         fou.addActionListener(new ActionListener(){
 93 
 94             @Override
 95             public void actionPerformed(ActionEvent e) {
 96                 // TODO Auto-generated method stub
 97                 logout();
 98             }    
 99         });
100         
101     }
102     void login(){
103         String accout = a3.getSelectedItem().toString();
104         String pwd = new String(password.getPassword());
105         if(accout.equals("huakaihualuo")&&pwd.equals("666666")){
106             setVisible(false);
107             showMainWindow();
108         }else{
109             JOptionPane.showMessageDialog(this, "用户名是"+accout + ",密码是" + pwd);
110         }
111     }
112     void logout(){
113         int ret = JOptionPane.showConfirmDialog(this,"退出登录？","取消登录",JOptionPane.YES_NO_OPTION);
114         if(ret ==JOptionPane.YES_NO_OPTION){
115             dispose();
116         }
117     }
118     void showMainWindow(){
119         MainWindow frm = new MainWindow();
120         frm.setVisible(true);
121     }
122 }
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原文地址：https://www.cnblogs.com/tianyahaijiao1/p/5292993.html