Ans :
All servlets must implement the Servlet interface either directly or indirectly. Java
servlets class does not have a main() method, so all servlets must implement the
javax.servlet.Servlet interface. It defines five methods, including three life-cycle
methods. You may read the life-cycle methods such as init(), service() and destroy() in
the subsequent section 2.5 and other two methods are getServletConfig() and
getServletInfo().
