help needed in java coding

u talking abt JDBC??

You could be more specific, like in which part you need help? Database connectivity or GUI design?

Hi friend first of all u understand the database connectivity

hi!
This is all related to database connectivity.
You'll have to maintain a database for the same recording the logins and the passwords etc and connect it to your file.

You can follow this step
1. You need to create a table to store this information
2. Learn JDBC its easy ... make the connection.. u will find lots of tutorial on this .
3. Make a simple UI is java swing ....

thats it ... if u need further then reply ... i mean wat kind of problem u r facing ..... paste the error msg here ...(if u have any)

These are two classes from my project:

Login.java :  

import javax.swing.*; 
import java.awt.event.*; 
import java.sql.*; 
 
public class Login 
{ 
    static JFrame f; 
    static JPanel p1; 
    static JPanel p2; 
    static JPanel p3; 
    static JLabel lUserName; 
    static JTextField tUserName; 
    static JLabel lPassword; 
    static JPasswordField pPassword; 
    static JButton bLogin; 
    static JButton bCancel;    
   
    public static void showLoginWindow () 
    {         
        f = new JFrame ("Login"); 
        p1 = new JPanel (); 
        p2 = new JPanel (); 
        p3 = new JPanel (); 
        lUserName = new JLabel ("User Name : "); 
        tUserName = new JTextField (20); 
        lPassword = new JLabel ("Password  :  "); 
        pPassword = new JPasswordField (20); 
        bLogin = new JButton ("Login"); 
        bLogin.setToolTipText ("Click here to Login"); 
        bLogin.setMnemonic('L'); 
        bLogin.addActionListener (new ActionListener () 
        { 
            public void actionPerformed (ActionEvent e) 
            {                                                  
                try                     
                {                                                                        
                    Connection con = null; 
                    Statement stmt; 
                    ResultSet rs;   
                       boolean flag=false;                                                                            
                    con = DBConnect.getCon ();                          
                    stmt = con.createStatement ();                                                                 
                    rs = stmt.executeQuery ("Select * from USERS  where USERNAME='" + tUserName.getText () + "' and PASSWORD = '" + pPassword.getText() + "'" ); 
                       while(rs.next()) 
                       {                                                 
                           if(rs.getString("USERNAME").equals(tUserName.getText()) &&   rs.getString("PASSWORD").equals(pPassword.getText())) 
                           {                                
                               flag=true; 
                           }                                
                       }  
                       if(flag==false) 
                       {                                         
                           Result_AnalysisFrame frame= new Result_AnalysisFrame();  
                        frame.setVisible(true);   
                        f.hide(); 
                       } 
                       else 
                       { 
                           JOptionPane.showMessageDialog(null,"Login Failed !!!","Login Fail",JOptionPane.WARNING_MESSAGE); 
                       } 
                } 
                catch (Exception ex) 
                { 
                    JOptionPane.showMessageDialog (null, ex, "Error", JOptionPane.INFORMATION_MESSAGE); 
                } 
            } 
        } 
        ); 
        bCancel = new JButton ("Cancel"); 
        bCancel.setToolTipText ("Click here to Exit"); 
        bCancel.setMnemonic('C'); 
        bCancel.addActionListener (new ActionListener () 
        { 
            public void actionPerformed (ActionEvent e) 
            { 
                System.exit (0); 
            } 
        } 
        ); 
        p1.add (lUserName); 
        p1.add (tUserName); 
        p2.add (lPassword); 
        p2.add (pPassword); 
        p3.add (bLogin); 
        p3.add (bCancel); 
 
        Box bx1 = Box.createVerticalBox (); 
        bx1.add (p1); 
        bx1.add (p2); 
        bx1.add (p3); 
 
        f.getContentPane ().add (bx1); 
        f.setVisible (true); 
        f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); 
        f.setLocation (380, 280);       
        f.pack (); 
        f.setResizable (false);         
    } 
} 
 
 

DBConnect.java :

 
import java.sql.*; 
import oracle.jdbc.*; 
import javax.swing.*; 
 
public class DBConnect 
{ 
 
    public static Connection getCon () 
    { 
        Connection con = null; 
        String url = "jdbc:odbc:RA2"; 
 
        try 
        { 
            Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); 
             
            con = DriverManager.getConnection (url, "RA", "RA"); 
        }                
        catch (Exception e) 
        { 
            JOptionPane.showMessageDialog (null, e, "Error", JOptionPane.INFORMATION_MESSAGE); 
        } 
        return con; 
    } 
}

the info is not sufficient to rectify. Looking at code(the jdbc ones) it seems more like a driver issue. But before proceeding further, i think you should first go thru the basics of jdbc and the types of drivers available with databases.

I'll just give you intro with the 4 types of drivers ->
1. JDBC ODBC driver - this is the driver you have used in your program. This driver converts the jdbc calls into odbc acting as a bridge. So make sure have configured the odbc correctly. eg if you are using oracle as db so you have to configure the odbc for oracle. (for more reference, google 😁)

2. Native-API partly Java technology-enabled driver - in this the java converts the jdbc calls into db api calls.

3. Net-protocol fully Java technology-enabled driver - in this JDBC API calls is translated into a DBMS-independent net protocol which is then translated to a DBMS protocol by a server

4. Native-protocol fully Java technology-enabled driver - converts JDBC technology calls into the network protocol used by DBMSs directly. This is a pure java based driver !

The above was just informative, don't need to think deep into it. It won't harm to know.

So the take-away is that your code is using the driver of type 1 so first you must check the configuration for Db specific odbc configuration.