Question 1

If class Dog has a subclass Retriever, which of the following is true?

Accepted Answer

A)  Because of single inheritance, Dog can have no other subclasses. 
B)  Because of single inheritance, Retriever can extend no other class except Dog. 
C)  The relationship between these classes implies that Dog "is-a" Retriever. 
D)  The relationship between these classes implies that Retriever "has-a" Dog. 
A)  Because of single inheritance, Dog can have no other subclasses. 
B)  Because of single inheritance, Retriever can extend no other class except Dog. 
C)  The relationship between these classes implies that Dog "is-a" Retriever. 
D)  The relationship between these classes implies that Retriever "has-a" Dog.

Question 2

Which operator is used to determine if an object is of a particular class type?

Accepted Answer

A)  The operator new 
B)  The dot (.) operator 
C)  The instanceof operator 
D)  The + operator 
A)  The operator new 
B)  The dot (.) operator 
C)  The instanceof operator 
D)  The + operator

Question 3

A subclass cannot directly access public members of a superclass.

Accepted Answer

A) True 
 B)False

Question 4

Based on the diagram in the accompanying figure, the method area in the class Box ____ the method area in the class Rectangle.

Accepted Answer

A)  overloads 
B)  overrides 
C)  overstates 
D)  deletes 
A)  overloads 
B)  overrides 
C)  overstates 
D)  deletes

Question 5

Inheritance is an example of what type of relationship?

Accepted Answer

A)  is-a 
B)  has-a 
C)  was-a 
D)  had-a 
A)  is-a 
B)  has-a 
C)  was-a 
D)  had-a

Question 6

The classes Reader and Writer are derived from the class ____.

Accepted Answer

A)  Streams 
B)  Inputs 
C)  Outputs 
D)  Object 
A)  Streams 
B)  Inputs 
C)  Outputs 
D)  Object

Question 7

Java uses late binding for methods that are private but not for methods that are marked final.

Accepted Answer

A) True 
 B)False

Question 8

If a class implements an interface, it must ____.

Accepted Answer

A)  provide definitions for each of the methods of the interface 
B)  override all constants from the interface 
C)  rename all the methods in the interface 
D)  override all variables from the interface 
A)  provide definitions for each of the methods of the interface 
B)  override all constants from the interface 
C)  rename all the methods in the interface 
D)  override all variables from the interface

Question 9

Composition is also called ____.

Accepted Answer

A)  inheritance 
B)  aggregation 
C)  overloading 
D)  overriding 
A)  inheritance 
B)  aggregation 
C)  overloading 
D)  overriding

Question 10

Any new class you create from an existing class is called a(n) ____.

Accepted Answer

A)  base class 
B)  superclass 
C)  derived class 
D)  extended class 
A)  base class 
B)  superclass 
C)  derived class 
D)  extended class

If class Dog has a subclass Retriever, which of the following is true?

Which operator is used to determine if an object is of a particular class type?

A subclass cannot directly access public members of a superclass.

Based on the diagram in the accompanying figure, the method area in the class Box ____ the method area in the class Rectangle.

Inheritance is an example of what type of relationship?

The classes Reader and Writer are derived from the class ____.

Java uses late binding for methods that are private but not for methods that are marked final.

If a class implements an interface, it must ____.

Composition is also called ____.

Any new class you create from an existing class is called a(n) ____.

An Overview of Computers and Programming Languages

Basic Elements of Java

Introduction to Objects and Input/output

Control Structures I: Selection

Control Structures II: Repetition

Graphical User Interface GUI and Object-Oriented Design OOD

User-Defined Methods

User-Defined Classes

Arrays

Handling Exceptions and Events

Advanced Guis and Graphics

Recursion

Applications of Arrays Searching and Sorting and Strings

Filters

Exam 10: Inheritance and Polymorphism

If class Dog has a subclass Retriever, which of the following is true?

Which operator is used to determine if an object is of a particular class type?

A subclass cannot directly access public members of a superclass.

Based on the diagram in the accompanying figure, the method area in the class Box ____ the method area in the class Rectangle.

Inheritance is an example of what type of relationship?

The classes Reader and Writer are derived from the class ____.

Java uses late binding for methods that are private but not for methods that are marked final.

If a class implements an interface, it must ____.

Composition is also called ____.

Any new class you create from an existing class is called a(n) ____.

An Overview of Computers and Programming Languages

Basic Elements of Java

Introduction to Objects and Input/output

Control Structures I: Selection

Control Structures II: Repetition

Graphical User Interface GUI and Object-Oriented Design OOD

User-Defined Methods

User-Defined Classes

Arrays

Handling Exceptions and Events

Advanced Guis and Graphics

Recursion

Applications of Arrays Searching and Sorting and Strings

Filters