Connecting to database using java

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Java

MySQL

Ubuntu

netbeans

i have just installed mysql server 5 and NetBeans 7.1

i want to know how to use java to connect to database on mysql server

it is a code i found on net

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package database_con;
import java.sql.*;
/**
 *
 * @author engamir
 */
public class Database_con {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        System.out.println("MySQL Connect Example.");
        Connection conn = null;
        String url = "jdbc:mysql://localhost:3306/";
        String dbName = "test";
        String driver = "com.mysql.jdbc.Driver";
        String userName = "root"; 
        String password = "globalamirtarek";
        try
        {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            conn = DriverManager.getConnection(url+dbName,userName,password);
            System.out.println("Connected to the database");
            conn.close();
            System.out.println("Disconnected from database");
        } 
        catch (ClassNotFoundException | InstantiationException | IllegalAccessException | SQLException e) 
        {
            System.out.println(e.getMessage());
        }
    }
}

this code enter the catch with ClassNotFoundException

i can find this Driver under Drivers list under services on Netbeans and i can connect using it to the mysql database

can any one tell me if i make something wrong?