java在面板中点击按钮后弹出对话框

 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 }

为按钮添加个监听器

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当程序运行的时候弹出一个提示框，显示运行的极度条。

初始用户ID和密码都设置成123。密码正确后出现正在登陆的提示框，等登陆成功后，就关闭提示，退出程序。

  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     JPasswordField jpUsePwd = new JPasswordField();
 16 
 17     JButton jbEnter = new JButton();
 18 
 19     JButton jbExit = new JButton();
 20     
 21     //设置登陆的用户名和密码
 22     
 23     String userID="123";
 24     String userPwd="123";
 25     
 26     public Test() {
 27         super("用户登陆界面");
 28         try {
 29             // 设置窗体的大小、位置、可见性
 30 
 31             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     }
 43 
 44     private void jbInit() throws Exception {
 45         // 初始化各控件，设置控件位置，将控件添加到面板上
 46         getContentPane().setLayout(null);
 47         jtUserID.setText("");
 48         jtUserID.setBounds(new Rectangle(182, 50, 141, 22));
 49         jLabel2.setText("用户名：");
 50         jLabel2.setBounds(new Rectangle(83, 50, 78, 24));
 51         jLabel3.setText("密    码：");
 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(false);
 76         JOptionPane.showMessageDialog(null, "正在登陆中....");
 77         Thread.sleep(3000);
 78         this.dispose();
 79         }catch(Exception e){
 80             System.out.println(e);
 81         }
 82         
 83     }
 84 
 85 //当点击按钮的时候触发下面的方法
 86     public void actionPerformed(ActionEvent e) {
 87         try{
 88         String command=e.getActionCommand();
 89         if (command.equals("退出")) {
 90             System.exit(0);
 91         } else {
 92 
 93             // 管理员登陆功能实现
 94 
 95             if (jtUserID.getText().equals("")
 96                     || new String(jpUsePwd.getPassword()).equals("")) {
 97                 JOptionPane.showMessageDialog(null, "请输入完整数据");
 98             } 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 }

转载于:https://www.cnblogs.com/JoannaQ/archive/2012/08/08/2628010.html