Error in connection to oracle

Question

i wrote this code to test my connection, and i got an error saying that "Could not find the database driver" can any one tell my what's wrong in this code or what's missing.
public class DataBase {
     public DataBase(){
          Connection connection = null;
     try {
     // Load the JDBC driver
     String driverName = "oracle.jdbc.driver.OracleDriver";
     Class.forName(driverName);
     // Create a connection to the database
     String serverName = "http://localhost:7777";
     String portNumber = "1521";
     String sid = "mydatabase";
     String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid;
     String username = "scott";
     String password = "tiger";
     connection = DriverManager.getConnection(url, username, password);
     } catch (ClassNotFoundException e) {
          JOptionPane.showMessageDialog(null,"Coud not find the database driver");
     // Could not find the database driver
     } catch (SQLException e) {
          JOptionPane.showMessageDialog(null,"Coud not connect to the database ");
     // Could not connect to the database
     public static void main(String[] args) {
          new DataBase();
}

Answer 1

hi again,
i opened the link that you have refered to, and i went through all the steps in that link, i have already a classpath in my system variables and the value of it is C:\Program Files\Java\jre1.5.0_04\lib\ext\QTJava.zip
the link you provide say i have to make a new one and put the value of it yes so i don't know what to do. i hope that you understand me.
thanks