/**
 *
 * @author Mutasem
 */
public class Super {
    
}
class Sub1 extends Super{
    
}
class Sub2 extends Super{
    
}
class Sub3 extends Super{
    
}
=

/**
 *
 * @author Mutasem
 */
public class SuperFactory {
    public static Super getSuper(String type){
    if(type.equalsIgnoreCase("Sub1"))
        return new Sub1();
    if(type.equalsIgnoreCase("Sub2"))
        return new Sub2();
    if(type.equalsIgnoreCase("Sub3"))
        return new Sub3();
    return null;
    }
}

/**
 *
 * @author Mutasem
 */
public abstract class Connection {
    public abstract void connect();
}
class SqlServerConnection extends Connection {
    public Object ServerDeriver, ServerConfig1, ServerConfig2;
    @Override
    public void connect() {
//Sql server connection logic
    }
}
class MySQLConnection extends Connection {
    public Object MySQLDriver,MySQLConfig;

    @Override
    public void connect() {
//MySQL connection logic
    }
}
class OracleConnection extends Connection {
    public Object OracleDriver,OracleConfig1, OracleConfig2, OracleConfig3;
    @Override
    public void connect() {
//Oracle connection logic
    }
}

/**
 *
 * @author Mutasem
 */
public class Client {

    public static void main(String[] args) {
        /* A lot of code here */

        MySQLConnection connection = new MySQLConnection();
        connection.MySQLDriver = "MySQL Driver object";
        connection.MySQLConfig = "Specific Config";
        connection.connect();
        /* ...... */
    }
}

/**
 *
 * @author Mutasem
 */
public class Client {

    public static void main(String[] args) {
        /* A lot of code here */
         
//        MySQLConnection connection=new MySQLConnection();
//        connection.MySQLDriver="MySQL Driver object";
//        connection.MySQLConfig="Specific Config";
        OracleConnection connection = new OracleConnection();
        connection.OracleDriver = "Oracle Driver";
        connection.OracleConfig1 = "Some Value";
        connection.OracleConfig2 = "Some Value";
        connection.OracleConfig3 = "Some Value";
        connection.connect();
        /* ...... */
    }
}

/**
 *
 * @author Mutasem
 */
public class ConnectionFactory {
    public static Connection getConnection(String type) throws Exception {
        if (type.equalsIgnoreCase("MYSQL")) {
            MySQLConnection connection = new MySQLConnection();
            connection.MySQLDriver = "MySQL Driver object";
            connection.MySQLConfig = "Specific Config";
            return connection;
        }
        if (type.equalsIgnoreCase("SQLSERVER")) {
            SqlServerConnection connection = new SqlServerConnection();
            connection.ServerDeriver = "Driver object";
            connection.ServerConfig1 = "Specific Config1";
            connection.ServerConfig2 = "Specific Config2";
            return connection;
        }
        if (type.equalsIgnoreCase("ORACLE")) {
            OracleConnection connection = new OracleConnection();
            connection.OracleDriver = "Driver object";
            connection.OracleConfig1 = "Specific Config";
            connection.OracleConfig2 = "Specific Config2";
            connection.OracleConfig3 = "Specific Config2";
            return connection;
        }
        throw new Exception("Unsupported server");
    }
}

/**
 *
 * @author Mutasem
 */
public class FactoryClient {

    public static void main(String[] args) throws Exception {
        Connection connection = ConnectionFactory.getConnection("MYSQL");
        //or Connection connection=ConnectionFactory.getConnection("SQLSEVER");
        // or Connection connection=ConnectionFactory.getConnection("ORACLE");
        connection.connect();
    }
}