java in the panel after clicking the button pop-up dialog

 1 import javax.swing.*;
 2 import java.awt.event.*;
 3 import java.awt.*;
 4 
 5 public class ShowDIalog extends JFrame{
 6     JButton button=new JButton("显示");
 7     public ShowDIalog(){
 8     setLayout(new FlowLayout());
 9     add(button);
10     button.addActionListener(new ActionListener(){
11         public void actionPerformed(ActionEvent e){
12             JOptionPane.showMessageDialog(null,"Wath a fucking day!");
13         }
14     });
15     setVisible(true);
16     setSize(100,100);
17 }
18    public static void main(String[] args){
19        ShowDIalog s=new ShowDIalog();
20     }
21 }

Add a listener for the button

---------------------------------------

When the program is running a pop-up prompt box, show extreme stripe running.

The initial user ID and password are set to 123. After the correct password is login prompt box, etc. after a successful landing, you close the prompt, exit the program.

  1 import java.awt.*;
  2 import javax.swing.*;
  3 import java.awt.event.*;
  4 
  5 public class Test extends JFrame implements ActionListener,Runnable {
  6     
  7     JLabel jLabel1 = new JLabel();
  8 
  9     JLabel jLabel2 = new JLabel();
 10 
 11     JTextField jtUserID = new JTextField();
 12 
 13     JLabel jLabel3 = new JLabel();
14  
15      the JPasswordField jpUsePwd = new new the JPasswordField ();
 16  
. 17      the JButton jbEnter = new new the JButton ();
 18 is  
. 19      the JButton jbExit = new new the JButton ();
 20 is      
21 is      // set login user name and password 
22 is      
23 is      String userID = "123" ;
 24      UserPwd = String "123" ;
 25      
26 is      public the Test () {
 27          Super ( "user login interface" );
 28          the try {
 29              // set the form of the size, position, visibility 
30  
31 is             jbInit();
 32             this.setVisible(true);
 33             this.setSize(410, 300);
 34             this.addWindowListener(new WindowAdapter() { // 清空内存
 35                         public void windowClosing(WindowEvent e) {
 36                             System.exit(0);
 37                         }
 38                     });
 39         } catch (Exception exception) {
 40             exception.printStackTrace();
 41         }
42 is      }
 43 is  
44 is      Private  void the jbInit () throws Exception {
 45          // initialization of the control, set the position control, to add the control panel 
46 is          the getContentPane () setLayout (. Null );
 47          jtUserID.setText ( "" );
 48          jtUserID .setBounds ( new new the Rectangle (182, 50, 141 is, 22 is ));
 49          jLabel2.setText ( "user name:" );
 50          jLabel2.setBounds ( new new the Rectangle (83, 50, 78, 24 ));
 51 is          jLabel3.setText ( "password:" );
 52         jLabel3.setBounds(new Rectangle(81, 91, 78, 24));
 53         jpUsePwd.setBounds(new Rectangle(182, 92, 140, 27));
 54         jbEnter.setBounds(new Rectangle(122, 197, 90, 25));
 55         jbEnter.setText("登陆");
 56         jbExit.setBounds(new Rectangle(217, 197, 90, 25));
 57         jbExit.setText("退出");
 58         this.getContentPane().add(jLabel2);
 59         this.getContentPane().add(jLabel3);
 60         this.getContentPane().add(jLabel1);
 61         this.getContentPane().add(jtUserID);
 62         this.getContentPane().add(jpUsePwd);
 63         this.getContentPane().add(jbEnter);
 64         this.getContentPane().add(jbExit);
 65 
 66         jbEnter.addActionListener(this);
 67         jbExit.addActionListener(this);
 68 
 69     }
 70 
 71 
 72 //多线程控制登陆信息框
 73     public void run(){
 74         try{
 75         this.setVisible ( to false );
 76          JOptionPane.showMessageDialog ( null , "is landed in ...." );
 77          the Thread.sleep (3000 );
 78          the this .Dispose ();
 79          } the catch (Exception E) {
 80              the System. Out.println (E);
 81          }
 82          
83      }
 84  
85  // when the button is triggered when the following method of 
86      public  void the actionPerformed (the ActionEvent E) {
 87          the try {
 88          String Command =e.getActionCommand ();
 89          IF (command.equals ( "exit" )) {
 90              System.exit (0 );
 91 is          } the else {
 92  
93              // administrator login functions implemented 
94  
95              IF (jtUserID.getText (). the equals ( "" )
 96                      || new new String (jpUsePwd.getPassword ()) the equals. ( "" )) {
 97                  JOptionPane.showMessageDialog ( null , "enter the full data" );
 98              } the else {
 99                          IF (jtUserID.getText().equals(userID)
100                                 && new String(jpUsePwd.getPassword())
101                                         .equals(userPwd)) {
102                             Thread t=new Thread(this);
103                             t.start();
104                             
105                         
106 
107                         }
108                      else {
109                         JOptionPane.showMessageDialog(null, "帐号或者密码错误");
110                         jtUserID.setText("");
111                         jpUsePwd.setText("");
112                         }
113                         }
114             }
115         }catch(Exception ex){
116             System.out.println(ex);
117         }
118         }
119     public static void main(String[] args) {
120          new Test();
121     }
122 }

Reproduced in: https: //www.cnblogs.com/JoannaQ/archive/2012/08/08/2628010.html