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Confusion at page no-264 HFSJ 2  RSS feed

 
muksh sharma
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Guys I am at page no 264 and stuck with this column ""Usually Implemented by".
The thing that I could not understand is that the mark used in the column is for "yes" or "no".

like HttpSessionListener usually implemented by "some other class" or not?
 
Shailesh Narkhede
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yes HttpSessionListener is implemeted by some other class.
method overridden is called from that class.

 
Consider Paul's rocket mass heater.
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