Chapter 10 Review

Question 1

A class that contains at least on abstract method

Answer 1

Abstract Class

Question 2

Class from which an object is instantiated

Answer 2

Concrete Class

Question 3

the use of a super class variable to invoke methods on a super class and sub-class objects.

Answer 3

Polymorphism

Question 4

Methods that are not interface methods and that do not provide implementations must be declared using keyword

Answer 4

Abstract

Question 5

Casting a reference stored in a superclass variable to a subclass type is called

Answer 5

down-casting

Question 6

An abstract class can include both methods with implementation and abstract methods

Answer 6

True

Question 7

If a superclass declares an abstract method, a subclass must implement that method

Answer 7

False

Question 8

Only a concrete subclass must implement the method

Answer 8

True

Question 9

Abstract classes can be used to instantiate objects

Answer 9

False

Question 10

You may have several levels of abstract class in a program

Answer 10

True

Question 11

Constructors and Static methods can be declared abstract

Answer 11

False