Test your knowledge

1. A class can implement:

   1. Only one interface.

   2. One or more interfaces.

   3. A maximum of two interfaces.

2. When a class implements an interface:

   1. It can also inherit from a superclass.

   2. It cannot inherit from a superclass.

   3. It can inherit only from an abstract superclass but not from concrete superclasses.

3. An interface:

   1. Can inherit from a superclass.

   2. Cannot inherit from either a superclass or another interface.

   3. Can inherit from another interface.

4. Which of the following lines declares a class named WonderDog that implements the Hideable interface:

   1. public class WonderDog extends Hideable {

   2. public class WonderDog implements Hideable {

   3. public class WonderDog: Hideable {

5. An interface is:

   1. A method.

   2. A type.

   3. An abstract class.