java 13 interview questions and answers

Every java class will have aleast one constructor and servlets are no exception to this. But while using servlets ,we never instantiate the servlet rather the container does it for us by using the newInstance() defined in the Class class;  which in turn uses the empty(Default) constructor to create a new instance of the servlet. … Read more

The destroy() method is called only once at the end of the life cycle of a servlet. This method gives your servlet a chance to close database connections, halt background threads, write cookie lists or hit counts to disk, and perform other such cleanup activities. After the destroy() method is called, the servlet object is … Read more

The service() method is the main method to perform the actual task. The servlet container (i.e. web server) calls the service() method to handle requests coming from the client( browsers) and to write the formatted response back to the client. Each time the server receives a request for a servlet, the server spawns a new thread and … Read more

The init method is designed to be called only once. It is called when the servlet is first created, and not called again for each user request. So, it is used for one-time initializations, just as with the init method of applets. The servlet is normally created when a user first invokes a URL corresponding … Read more

A servlet life cycle can be defined as the entire process from its creation till the destruction. The following are the paths followed by a servlet The servlet is initialized by calling the init () The servlet calls service()method to process a client’s request. The servlet is terminated by calling the destroy() Finally, servlet is garbage collected by … Read more