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why do we need init() rather than a constructor?
Please answer in reference of Servlet and Applet.
How does the init() of Applet differ from Servlet?
The
init()method creates and loads the servlet. But the servlet instance is first created through the constructor (done by Servlet container). We cannot write constructors of a servlet class with arguments in servlet (It will throw Exception). So, They provided ainit()method that accepts an ServletConfig object as an argument. ServletConfig object supplies a servlet with information about its initialization (init) parameters. Servlet class cannot declare a constructor with ServletConfig object as a argument and cannot access ServletConfig object.More info at: http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/Servlets6.html