Considering the event processing classes, what is the advantage of extending an adaptor class compared to implementing an interface?
A) Adaptors save the programmer from having to create a collection of empty-bodied methods
B) Adaptors save the programmer from having to create inner classes
C) Adaptors can be used even when interfaces cannot
D) Adaptors are more efficient at run time
E) none of the above

Question

Quizplus · Accepted Answer

A) An adaptor class provides empty bodies for all the methods in the interface for which is defined. This saves the programmer from having to implement these methods-especially since not all of them may need to be declared. So, using an Adaptor may be far more efficient for the programmer (the runtime efficiency remains the same).

Considering the Event Processing Classes, What Is the Advantage of Extending