单选题：Which of the following is not true about adapter classes?
Which of the following is not true about adapter classes? @[D](2)
A. They implement their corresponding listener interface.
B. They provide empty implementations for every method in their corresponding interface.
C. They are useful only for interfaces with more than more method.
D. Using an adapter class is more efficient because only the method that you override are invoked by the even source.
A.They implement their corresponding listener interface.
B.They provide empty implementations for every method in their corresponding interface.
C.They are useful only for interfaces with more than more method.
D.Using an adapter class is more efficient because only the method that you override are invoked by the even source.
答案：D
A. They implement their corresponding listener interface.
B. They provide empty implementations for every method in their corresponding interface.
C. They are useful only for interfaces with more than more method.
D. Using an adapter class is more efficient because only the method that you override are invoked by the even source.
A.They implement their corresponding listener interface.
B.They provide empty implementations for every method in their corresponding interface.
C.They are useful only for interfaces with more than more method.
D.Using an adapter class is more efficient because only the method that you override are invoked by the even source.
答案：D