用java实现的一个应用程序,源码非常完整,可以直接运行

				package 毕业设计;
				
				import java.awt.Dialog;
				import java.awt.Frame;
				import javax.swing.JOptionPane;
				import javax.swing.JDialog;
				import javax.swing.JPanel;
				import javax.swing.JLabel;
				import java.awt.*;
				import javax.swing.JTextField;
				import javax.swing.JPasswordField;
				import javax.swing.JButton;
				import java.awt.event.ActionEvent;
				import java.awt.event.ActionListener;
				import javax.swing.ImageIcon;
				import java.awt.event.*;
				
				public class dlgEnter extends Dialog {
				    JPanel panel1 = new JPanel();
				    JLabel lblId = new JLabel();
				    JTextField txtId = new JTextField();
				    JLabel lblPassword = new JLabel();
				    JPasswordField pswPassword = new JPasswordField();
				    JButton btnOK = new JButton();
				    JButton btnExit = new JButton();
				    JLabel lblMap = new JLabel(new ImageIcon("Map/0040.jpg"));
				    public dlgEnter(Frame owner, String title, boolean modal) {
				        super(owner, title, modal);
				        try {
				//            setDefaultCloseOperation(DISPOSE_ON_CLOSE);
				            jbInit();
				            pack();
				        } catch (Exception exception) {
				            exception.printStackTrace();
				        }
				    }
				
				    public dlgEnter() {
				        this(new Frame(), "dlgEnter", false);
				    }
				
				    private void jbInit() throws Exception {
				        panel1.setLayout(null);
				        setTitle("密码验证");
				        lblId.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
				        lblId.setText("卡  号:");
				        lblId.setBounds(new Rectangle(54, 49, 58, 37));
				        txtId.setBackground(Color.white);
				        txtId.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
				        txtId.setText("3");
				        txtId.setBounds(new Rectangle(114, 50, 171, 35));
				        lblPassword.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
				        lblPassword.setText("密  码:");
				        lblPassword.setBounds(new Rectangle(55, 112, 59, 31));
				        pswPassword.setBackground(Color.white);
				        pswPassword.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
				        pswPassword.setText("3");
				        pswPassword.setBounds(new Rectangle(113, 109, 174, 35));
				        btnOK.setBackground(new Color(118, 184, 255));
				        btnOK.setBounds(new Rectangle(90, 178, 80, 36));
				        btnOK.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
				        btnOK.setText("确  定");
				        btnOK.addActionListener(new dlgEnter_btnOK_actionAdapter(this));
				        btnExit.setBackground(new Color(118, 184, 255));
				        btnExit.setBounds(new Rectangle(203, 178, 82, 35));
				        btnExit.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18));
				        btnExit.setText("退  出");
				        btnExit.addActionListener(new dlgEnter_btnExit_actionAdapter(this));
				        lblMap.setText("");
				        lblMap.setBounds(new Rectangle(0, 0, 400, 300));
				        add(panel1);
				        panel1.add(lblId);
				        panel1.add(txtId);
				        panel1.add(lblPassword);
				        panel1.add(pswPassword);
				        panel1.add(btnOK);
				        panel1.add(btnExit);
				        panel1.add(lblMap);
				        this.setResizable(false);
				        addWindowListener(new close());
				    }
				
				    public void ShowEnter() {
				        this.setSize(400, 300);
				        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
				        Dimension dlgSize = this.getSize();
				        if (dlgSize.height > screenSize.height) {
				            dlgSize.height = screenSize.height;
				        }
				        if (dlgSize.width > screenSize.width) {
				            dlgSize.width = screenSize.width;
				        }
				        this.setLocation((screenSize.width - dlgSize.width) / 2,
				                         (screenSize.height - dlgSize.height) / 2);
				        this.setModal(true);
				        this.setVisible(true);
				    }
				
				    public void btnExit_actionPerformed(ActionEvent e) {
				        System.exit(0);
				    }
				
				    private class close extends WindowAdapter{
				        public void windowClosing(WindowEvent e){
				            System.exit(0);
				        }
				    }
				
				    public void btnOK_actionPerformed(ActionEvent e) {
				        UserConDB userDB = new UserConDB();
				        String Id = txtId.getText();
				        String Password = String.valueOf(pswPassword.getPassword());
				        boolean pwd = userDB.VerifyPassword(Id, Password);
				        if (pwd) {
				            userDB.setIsUsing();
				            userDB.UpdateIsUsing(Id);
				            this.dispose();
				        } else {
				            JOptionPane.showMessageDialog(this, "帐号不存在或密码错误!", "提示",
				                                          JOptionPane.ERROR_MESSAGE);
				            txtId.setText("");
				            pswPassword.setText("");
				        }
				        userDB.CloseUserDB();
				    }
				}
				
				
				class dlgEnter_btnOK_actionAdapter implements ActionListener {
				    private dlgEnter adaptee;
				    dlgEnter_btnOK_actionAdapter(dlgEnter adaptee) {
				        this.adaptee = adaptee;
				    }
				
				    public void actionPerformed(ActionEvent e) {
				        adaptee.btnOK_actionPerformed(e);
				    }
				}
				
				
				class dlgEnter_btnExit_actionAdapter implements ActionListener {
				    private dlgEnter adaptee;
				    dlgEnter_btnExit_actionAdapter(dlgEnter adaptee) {
				        this.adaptee = adaptee;
				    }
				
				    public void actionPerformed(ActionEvent e) {
				        adaptee.btnExit_actionPerformed(e);
				    }
				}