Test your knowledge

1. Which of the following lines declares an instance method that cannot be overridden in any subclass:

   1. public void talk(): final {

   2. public final void talk() {

   3. public notOverrideable void talk() {

2. We have an abstract superclass named Shape. The Circle class is a subclass of Shape and is a concrete class. If we create an instance of Circle named circle, this instance will also be:

   1. An instance of Shape.

   2. A subclass of Circle.

   3. An abstract superclass of Circle.

3. In UML diagrams, class names that use italic text format indicate that they are:

   1. Concrete classes.

   2. Classes that override at least one member inherited from its superclass.

   3. Abstract classes.

4. Which of the following lines declares a class that cannot be subclassed:

   1. public final class Dog extends VirtualAnimal {

   2. public final class Dog subclasses VirtualAnimal {

   3. public final Dog subclasses VirtualAnimal {

5. Which of the following lines declares a concrete class named Circle that can be subclassed and whose superclass is the Shape abstract...