If you wanna using jdbc  you should first install maxdb driver  for windows
and then using jdbc:odbc to connect  to it :

try {
    Connection connection = null;
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

        String serverName = "localhost";
        String portNumber = "1521";
        String sid = "orcl";
        String url = "jdbc:odbc:orcl";
        String username = "kunal";
        String password = "kunal";
        connection = DriverManager.getConnection(url, username, password);
} catch(SQLException se) {
         se.printStackTrace();
}