import java.sql.*;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import javax.swing.JOptionPane;
 
public class Conn
{
    public String PROP_FILE = "initial.ini";
 
    public Conn() {
    }
 
    public Connection getConnection() throws SQLException {
        Connection cn = null;
        try {            
            Class.forName("com.mysql.jdbc.Driver");
            Properties p2 = new Properties();
            p2 = loadProperties(PROP_FILE);             
            String server;
            String database;
            String userID;
            String password;
            String url;
 
            server = p2.getProperty("Server");
            database = p2.getProperty("Database");
            userID = p2.getProperty("UserID");
            password = p2.getProperty("Password");
 
            url = "jdbc:mysql://" + server + "/" + database;
            cn = DriverManager.getConnection (url, userID, password);                        
            return cn;
        }
        catch (SQLException se) 
        {
            System.out.println(se.toString());
            return null;
        } catch (Exception ex) 
        {
            System.out.println(ex.toString());
            return null;
        }
    }
 
    public static Properties loadProperties(String sFile) {
        Properties p = new Properties();
            try {
            FileInputStream in = new FileInputStream(sFile);
            p.load(in);            
            in.close();
        } catch (IOException iOException) {
            JOptionPane.showMessageDialog(null, iOException);
        }
        return p;        
    }
}
 
 
in all GUI forms, I only set this code :
 
void isiTable(String kataKunci)
    {
        String SQL = "";
        SQL = "SELECT UserID, UserName, Status FROM masteruser ";
        tabMode.setRowCount(0);
        try
        {
            [b][color="Green"]Koneksi getCn = new Conn();
            Connection cn = getCn.getConnection();[/color][/b]        
            Statement st = cn.createStatement();
            ResultSet rs = st.executeQuery(SQL);
            while(rs.next())
            {
                String Code = rs.getString(1);
                String Name = rs.getString(2);
                String Status = rs.getString(3);
                String[] data = {Code,Name,Status};
                tabMode.addRow(data);
            }                     
        }
        catch(SQLException e)
        {
 
        }        
    }

Connection cn = null;
        try {            
            Class.forName("com.mysql.jdbc.Driver");     
            String server;
            String database;
            String userID;
            String password;
            String url;
 
            server = "localhost:3306;
            database = "mydb";
            userID = "root";
            password = "justEnter";
 
            url = "jdbc:mysql://" + server + "/" + database;
            cn = DriverManager.getConnection (url, userID, password);                        
            return cn;
        }
        catch (SQLException se) 
        {
            System.out.println(se.toString());
            return null;
        } catch (Exception ex) 
        {
            System.out.println(ex.toString());
            return null;
        }