Android How to Program, 3/e

Answers to Self-Review Exercises (Sections G.6G.13)

1. G.3

   1. abstract.

   2. concrete.

   3. Polymorphism.

   4. abstract.

   5. downcasting.

2. G.4

   1. False. An abstract class can include methods with implementations and abstract methods.

   2. False. Trying to invoke a subclass-only method with a superclass variable is not allowed.

   3. False. Only a concrete subclass must implement the method.

   4. True.