Answer the following statements true (T) or false (F)

1) It’s possible to treat base-class objects and derived-class objects similarly.
2) All methods in an abstract class must be declared as abstract methods.
3) Attempting to invoke a derived-class-only method through a base-class variable is an error.
4) If a base class declares an abstract method, a derived class must implement that method.
5) An object of a class that implements an interface may be thought of as an object of that
interface type.

1) True.
2) False. An abstract class can include methods with implementations and abstract
methods.
3) True.
4) False. Only a concrete derived class must implement the method.
5) True.

Computer Science & Information Technology

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