Constructor is a Java basic feature of Java.and Init method is designed in such a way that it acts as a constructor but it just a function which returns nothing and called by container not by the user.So constructor gets executed at any cost but init method should be called by the container after executing constructor normally.So instead writing the constructor it is better to write code in init() method which is also acts as constructor.
But in servlet when the Servlet instantiated by the container which means constructor called first then init method after calling the init method servlet is ready to accept the requests and those requests are processed thru service method.Once destroy method is called by the container the servlet is not available for serving the clients and for some web servers when a new user comes to the servlet it calls the init() method not the constructor...
Hope you understand the differences...
But in servlet when the Servlet instantiated by the container which means constructor called first then init method after calling the init method servlet is ready to accept the requests and those requests are processed thru service method.Once destroy method is called by the container the servlet is not available for serving the clients and for some web servers when a new user comes to the servlet it calls the init() method not the constructor...
Hope you understand the differences...
