In what cases are adapter classes useful?
A)When an adapter GUI control is clicked.
B)When every method in the event-listener interface is to use the same functionality.
C)When it is not desirable to declare every method in the event-listener interface.
D)None of the above.

Question

Quizplus · Accepted Answer

Adapter classes are useful when it is not desirable to declare every method in the event-listener interface. This is because adapter classes provide default implementations for all methods in the interface, so it is only necessary to override the methods that are actually needed. This can make event handling code simpler and easier to read. Option A is incorrect because adapter classes are not specific to GUI controls. Option B is incorrect because if every method in the interface is to use the same functionality, it is not necessary to use an adapter class. Option D is incorrect because adapter classes are a useful tool for managing event handling in Java programs.

In What Cases Are Adapter Classes Useful