Java Interview Servlet Question

1.IN HOW MANY WAYS WE CAN DEVLOPE A SERVLET ?
2.WHAT IS THE DIFFERENCE BETWEEN ServletConfig & ServletContext ?
3.What are the Life Cycle Method of Servlet ?
4.Purpose of RequestDispatcher ?
5.Explain the purpose of Init() method & How many times it will be executed ?
6.Explain the difference between Get & Post method...