This is actually one of my favorite questions because it is an extremely important difference, but one that a lot of people have a hard time grasping. I will give you a little bit of background on it, but then I encourage you to search the forums and read the discussions.
The constructor is called by the container simply to create a POJO (plain old java object). It is not really a servlet (or at least it cannot do any servlet like things) until it has been initialized. As a developer, you shouldnever override the servlet's constructor.
The init method initializes the servlet, and gives it references to things like the servlet context. If you want something to happen when a servlet is initialized, override the no-arg init method and put it there.
“Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.” - Rich Cook
posted 12 years ago
Thanks a lot for the information.Now i have understood it