Chapter 10 - Multiple Choice

Question 1

1. The extends keyword applies to

❑ a class inheriting from another class.

❑ a variable.

❑ a method.

❑ an expression.

Answer 1

a class inheriting from another class.

Question 2

2. A Java class can inherit from two or more classes.

❑ true

❑ false

Answer 2

false

Question 3

3. In Java, multiple inheritance is implemented using the concept of

❑ an interface.

❑ an abstract class.

❑ a private class.

Answer 3

an interface

Question 4

4. Which of the following is inherited by a subclass?

❑ all instance variables and methods

❑ public instance variables and methods only

❑ protected instance variables and methods only

❑ protected and public instance variables and methods

Answer 4

protected and public instance variables and methods

Question 5

5. What Java keyword is used in a class header when a class is defined as inheriting from an interface?

❑ inherits

❑ includes

❑ extends

❑ implements

Answer 5

implements

Question 6

6. A Java class can implement one or more interfaces.

❑ true

❑ false

Answer 6

true

Question 7

7. How do you instantiate an object from an abstract class?

❑ With any constructor.

❑ With the default constructor only.

❑ You cannot instantiate an object from an abstract class.

Answer 7

You cannot instantiate an object from an abstract class.

Question 8

8. When a class overrides a method, what object reference is used to call the method inherited from the superclass?

❑ inherited

❑ super

❑ class

❑ methodName

Answer 8

super

Question 9

9. Where should the following statement be located in the body of a subclass constructor?

super( );
❑ It should be the last statement.

❑ It should be the first statement.

❑ It can be anywhere.

Answer 9

It should be the first statement

Question 10

10. If a class contains an abstract method, then

❑ the class must be declared abstract.

❑ the class is not abstract.

❑ the class may or may not be abstract.

❑ all of the above

Answer 10

the class must be declared abstract.

Question 11

11. What can you tell about the following method?

public void myMethod( )
{
}
❑ This method is abstract.

❑ This method is not abstract.

Answer 11

This method is not abstract.