Question 1

Example Code Ch 09-1
Consider the following class hierarchy:
  
-Refer to Example Code Ch 09-1: Y is a derived class of Z.

Accepted Answer

A) True 
 B)False

Question 2

A derived class has access to all of the methods of the parent class, but only to the protected or public instance data of the parent class.

Accepted Answer

A) True 
 B)False

Question 3

Explain the difference between implementing an interface and a derived class.

Accepted Answer

Implementing an interface means that you

Question 4

Aside from permitting inheritance, the visibility modifier protected is also used to

Accepted Answer

A)  permit access to the protected item by any class defined in the same package 
B)  permit access to the protected item by any static class 
C)  permit access to the protected item by any parent class 
D)  ensure that the class cannot throw a NullPointException 
E)  define abstract elements of an interface 
A)  permit access to the protected item by any class defined in the same package 
B)  permit access to the protected item by any static class 
C)  permit access to the protected item by any parent class 
D)  ensure that the class cannot throw a NullPointException 
E)  define abstract elements of an interface

Question 5

Example Code Ch 09-4
Given the following partial class definition:
public class A1
{
public int x;
private int y;
protected int z;
...
}
public class A2 extends A1
{
protected int a;
private int b;
...
}
public class A3 extends A2
{
private int q;
...
}
-Refer to Example Code Ch 09-4: Which of the following is true with respect to A1, A2, and A3?

Accepted Answer

A)  A1 is a subclass of A2 and A2 is a subclass of A3 
B)  A3 is a subclass of A2 and A2 is a subclass of A1 
C)  A1 and A2 are both subclasses of A3 
D)  A2 and A3 are both subclasses of A1 
E)  A1, A2 and A3 are all subclasses of the class A 
A)  A1 is a subclass of A2 and A2 is a subclass of A3 
B)  A3 is a subclass of A2 and A2 is a subclass of A1 
C)  A1 and A2 are both subclasses of A3 
D)  A2 and A3 are both subclasses of A1 
E)  A1, A2 and A3 are all subclasses of the class A

Question 6

Using the reserved word super, one can

Accepted Answer

A)  access a parent class's constructor(s) 
B)  access a parent class's methods and instance data 
C)  access a child class's constructor(s) 
D)  access a child class's methods and instance data 
E)  Both A and B are correct 
A)  access a parent class's constructor(s) 
B)  access a parent class's methods and instance data 
C)  access a child class's constructor(s) 
D)  access a child class's methods and instance data 
E)  Both A and B are correct

Question 7

One way to allow for user interactivity in a program is to use a dialog box.

Accepted Answer

A) True 
 B)False

Question 8

Example Code Ch 09-6
Assume that Student, Employee and Retired are all extended classes of Person, and all four classes have different implementations of the method getMoney. Consider the following code where ... indicates the required parameters for the constructors:
Person p = new Person(...);
int m1 = p.getMoney(); // assignment 1
p = new Student(...);
int m2 = p.getMoney(); // assignment 2
if (m2  50000)
p = new Retired(...);
int m3 = p.getMoney(); // assignment 3
-Refer to Example Code Ch 09-6: The reference to getMoney() in assignment 2 is to the class

Accepted Answer

A)  Person 
B)  Student 
C)  Employee 
D)  Retired 
E)  This cannot be determined by examining the code 
A)  Person 
B)  Student 
C)  Employee 
D)  Retired 
E)  This cannot be determined by examining the code

Question 9

Example Code Ch 09-1
Consider the following class hierarchy:
  
-Refer to Example Code Ch 09-1: A is a derived class of X.

Accepted Answer

A) True 
 B)False

Question 10

Example Code Ch 09-2
Assume that Poodle is a derived class of Dog and that Dog d = new Dog(...) and Poodle p = new Poodle(...) where the ... are the necessary parameters for the two classes.
-Refer to Example Code Ch 09-2: The assignment statement d = p; is legal even though d is not a Poodle.

Accepted Answer

A) True 
 B)False

Question 11

The reserved word, extends, is used to denote a has-a relationship.

Accepted Answer

A) True 
 B)False

Question 12

Java doesn't support multiple inheritance; but it does support the implementation of multiple interfaces.

Accepted Answer

A) True 
 B)False

Question 13

Example Code Ch 09-6
Assume that Student, Employee and Retired are all extended classes of Person, and all four classes have different implementations of the method getMoney. Consider the following code where ... indicates the required parameters for the constructors:
Person p = new Person(...);
int m1 = p.getMoney(); // assignment 1
p = new Student(...);
int m2 = p.getMoney(); // assignment 2
if (m2  50000)
p = new Retired(...);
int m3 = p.getMoney(); // assignment 3
-Refer to Example Code Ch 09-6: The reference to getMoney() in assignment 1 is to the class

Accepted Answer

A)  Person 
B)  Student 
C)  Employee 
D)  Retired 
E)  This cannot be determined by examining the code 
A)  Person 
B)  Student 
C)  Employee 
D)  Retired 
E)  This cannot be determined by examining the code

Question 14

Example Code Ch 09-3
Consider the class Car and the subclass SportsCar. Car has instance data of currentSpeed, type, year, cost, model, color and methods of accelerate, brake, getGasMileage, getInsuranceRate and determineSpeed.
-Refer to Example Code Ch 09-3: What instance data and methods might you define for SportsCar that are not part of Car?

Accepted Answer

A sports car may have a racing stripe, w

Question 15

Example Code Ch 09-4
Given the following partial class definition:
public class A1
{
public int x;
private int y;
protected int z;
...
}
public class A2 extends A1
{
protected int a;
private int b;
...
}
public class A3 extends A2
{
private int q;
...
}
-Refer to Example Code Ch 09-4: Which of the following is true regarding the use of instance data y of class A1?

Accepted Answer

A)  It is accessible in A1, A2, and A3 
B)  It is accessible in A1 and A2 
C)  It is accessible only in A1 
D)  It is accessible only in A3 
E)  It is accessible to any of the three classes 
A)  It is accessible in A1, A2, and A3 
B)  It is accessible in A1 and A2 
C)  It is accessible only in A1 
D)  It is accessible only in A3 
E)  It is accessible to any of the three classes

Question 16

Which of the following is not a method of the Object class?

Accepted Answer

A)  clone 
B)  compareTo 
C)  equals 
D)  toString 
E)  All of the above are methods of the Object class 
A)  clone 
B)  compareTo 
C)  equals 
D)  toString 
E)  All of the above are methods of the Object class

Question 17

The protected visibility modifier provides the best possible encapsulation that permits inheritance.

Accepted Answer

A) True 
 B)False

Question 18

Example Code Ch 09-6
Assume that Student, Employee and Retired are all extended classes of Person, and all four classes have different implementations of the method getMoney. Consider the following code where ... indicates the required parameters for the constructors:
Person p = new Person(...);
int m1 = p.getMoney(); // assignment 1
p = new Student(...);
int m2 = p.getMoney(); // assignment 2
if (m2  50000)
p = new Retired(...);
int m3 = p.getMoney(); // assignment 3
-Refer to Example Code Ch 09-6: The reference to getMoney() in assignment 3 is to the class

Accepted Answer

A)  Person 
B)  Student 
C)  Employee 
D)  Retired 
E)  This cannot be determined by examining the code 
A)  Person 
B)  Student 
C)  Employee 
D)  Retired 
E)  This cannot be determined by examining the code

Question 19

Consider a class Plane and three subclasses, Glider, PropPlane and Jet. What instance data that should be declared in Plane and what instance data should be declared in each of the three subclasses? Come up with at least 2 instance data unique to each of the four classes given that all instance data of Plane will be inherited into the subclasses.

Accepted Answer

Plane might include instance data such a

Question 20

Two children of the same parent class are known as

Accepted Answer

A)  aliases 
B)  relatives 
C)  clones 
D)  brothers 
E)  siblings 
A)  aliases 
B)  relatives 
C)  clones 
D)  brothers 
E)  siblings

Example Code Ch 09-1 Consider the following class hierarchy: -Refer to Example Code Ch 09-1: Y is a derived class of Z.

A derived class has access to all of the methods of the parent class, but only to the protected or public instance data of the parent class.

Explain the difference between implementing an interface and a derived class.

Aside from permitting inheritance, the visibility modifier protected is also used to

Using the reserved word super, one can

One way to allow for user interactivity in a program is to use a dialog box.

Example Code Ch 09-1 Consider the following class hierarchy: -Refer to Example Code Ch 09-1: A is a derived class of X.

Example Code Ch 09-2 Assume that Poodle is a derived class of Dog and that Dog d = new Dog(...) and Poodle p = new Poodle(...) where the ... are the necessary parameters for the two classes. -Refer to Example Code Ch 09-2: The assignment statement d = p; is legal even though d is not a Poodle.

The reserved word, extends, is used to denote a has-a relationship.

Java doesn't support multiple inheritance; but it does support the implementation of multiple interfaces.

Which of the following is not a method of the Object class?

The protected visibility modifier provides the best possible encapsulation that permits inheritance.

Two children of the same parent class are known as

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Polymorphism

Exceptions

Recursion

Collections

Filters

Exam 9: Inheritance

Example Code Ch 09-1 Consider the following class hierarchy: -Refer to Example Code Ch 09-1: Y is a derived class of Z.

A derived class has access to all of the methods of the parent class, but only to the protected or public instance data of the parent class.

Explain the difference between implementing an interface and a derived class.

Aside from permitting inheritance, the visibility modifier protected is also used to

Using the reserved word super, one can

One way to allow for user interactivity in a program is to use a dialog box.

Example Code Ch 09-1 Consider the following class hierarchy: -Refer to Example Code Ch 09-1: A is a derived class of X.

Example Code Ch 09-2 Assume that Poodle is a derived class of Dog and that Dog d = new Dog(...) and Poodle p = new Poodle(...) where the ... are the necessary parameters for the two classes. -Refer to Example Code Ch 09-2: The assignment statement d = p; is legal even though d is not a Poodle.

The reserved word, extends, is used to denote a has-a relationship.

Java doesn't support multiple inheritance; but it does support the implementation of multiple interfaces.

Which of the following is not a method of the Object class?

The protected visibility modifier provides the best possible encapsulation that permits inheritance.

Two children of the same parent class are known as

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Polymorphism

Exceptions

Recursion

Collections

Filters