Question 1

If you instantiate an abstract class, the class or object you wind up with

Accepted Answer

A)  is also an abstract class 
B)  is a normal class 
C)  is an interface 
D)  is a reference to an Object 
E)  you can't instantiate an abstract class 
A)  is also an abstract class 
B)  is a normal class 
C)  is an interface 
D)  is a reference to an Object 
E)  you can't instantiate an abstract class E

Question 2

A reference variable can refer to any object created from any class related to it by inheritance.

Accepted Answer

A) True 
 B)False  True

Question 3

One of the advantages of the linear search is that it does not require its data to be sorted.

Accepted Answer

A) True 
 B)False  True

Question 4

Code Example Ch 10-1
An int array stores the following values:
 $$\begin{array} { | l | l | l | l | l | l | l | } 
\hline 9 & 4 & 12 & 2 & 6 & 8 & 18 \
\hline
\end{array}$$
-Refer to Code Example Ch 10-1: Which of the following lists of numbers would accurately show the array after the first pass of the selection sort algorithm?

Accepted Answer

A)  9, 4, 12, 2, 6, 8, 18 
B)  2, 4, 9, 6, 12, 8, 18 
C)  2, 4, 12, 9, 6, 8, 18 
D)  2, 4, 6, 8, 9, 12, 18 
E)  2, 4, 9, 12, 6, 8, 18 
A)  9, 4, 12, 2, 6, 8, 18 
B)  2, 4, 9, 6, 12, 8, 18 
C)  2, 4, 12, 9, 6, 8, 18 
D)  2, 4, 6, 8, 9, 12, 18 
E)  2, 4, 9, 12, 6, 8, 18

Question 5

Polymorphism is achieved by

Accepted Answer

A)  overloading 
B)  overriding 
C)  embedding 
D)  abstraction 
E)  encapsulation 
A)  overloading 
B)  overriding 
C)  embedding 
D)  abstraction 
E)  encapsulation

Question 6

The type of the reference, not the type of the object, is used to determine which version of a method is invoked in a polymorphic reference.

Accepted Answer

A) True 
 B)False

Question 7

What kind of performance can you expect if you perform a linear search on a sorted array?

Accepted Answer

A)  The performance will be about the same as on an unsorted array. 
B)  The performance will be much better than on an unsorted array. 
C)  The performance will be much worse than on an unsorted array. 
D)  The performance will be worse by about n^2 in this case 
E)  None of these 
A)  The performance will be about the same as on an unsorted array. 
B)  The performance will be much better than on an unsorted array. 
C)  The performance will be much worse than on an unsorted array. 
D)  The performance will be worse by about n^2 in this case 
E)  None of these

Question 8

We compare sorting algorithms by examining

Accepted Answer

A)  the number of instructions executed by the sorting algorithm 
B)  the number of instructions in the algorithm itself (its length) 
C)  the types of loops used in the sorting algorithm 
D)  the amount of memory space required by the algorithm 
E)  A and D 
A)  the number of instructions executed by the sorting algorithm 
B)  the number of instructions in the algorithm itself (its length) 
C)  the types of loops used in the sorting algorithm 
D)  the amount of memory space required by the algorithm 
E)  A and D

Question 9

A GUI control that allows the user to specify a numeric value within a bounded range is a spinner.

Accepted Answer

A) True 
 B)False

Question 10

Both the insertion sort and the selection sort algorithms have efficiencies on the order of ________ where n is the number of values in the array being sorted.

Accepted Answer

A)  n 
B)  n * log n 
C)  n^2 
D)  n^3 
E)  the insertion sort has an efficiency of n and the selection sort has an efficiency of n^2 
A)  n 
B)  n * log n 
C)  n^2 
D)  n^3 
E)  the insertion sort has an efficiency of n and the selection sort has an efficiency of n^2

Question 11

Java allows one to create polymorphic references using inheritance and using interfaces.

Accepted Answer

A) True 
 B)False

Question 12

Can a program exhibit polymorphism if it only implements early binding?

Accepted Answer

A)  Yes, because one form of polymorphism is overloading. 
B)  No, because without late binding, polymorphism cannot be supported. 
C)  Yes, because as long as the program uses inheritance and/or interfaces, it supports polymorphism. 
D)  Yes, because early binding has nothing to do with polymorphism. 
E)  None of these 
A)  Yes, because one form of polymorphism is overloading. 
B)  No, because without late binding, polymorphism cannot be supported. 
C)  Yes, because as long as the program uses inheritance and/or interfaces, it supports polymorphism. 
D)  Yes, because early binding has nothing to do with polymorphism. 
E)  None of these

Question 13

If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if C1 c = new C1(); is performed at one point of the program, then a later instruction
c.whichIsIt(); will invoke the whichIsIt method defined in C1.

Accepted Answer

A) True 
 B)False

Question 14

Write an insertion sort method to sort an array of String values (instead of an array of int values). Assume the array is an instance data of the current class called list, and number is an int instance data that stores the number of elements currently stored in list.

Accepted Answer

public void insertionSortForString()
{
f

Question 15

Consider the code shown below. It contains a syntax error, preventing successful compilation and execution. What is the error?
public class Inherit
{
class Figure
{
void display()
{
System.out.println("Figure");
}
}
class Rectangle extends Figure
{
final void display()
{
System.out.println("Rectangle");
}
}
class Box extends Rectangle
{
void display() {
System.out.println("Box");
}
}
Inherit()
{
Figure f = new Figure();
Rectangle r = new Rectangle();
Box b = new Box();
b.display();
}
public static void main(String[] args)
{
new Inherit();
}
}
f.display();
r.display();

Accepted Answer

Consider the effect of the final modifie

Question 16

Demonstrate how the following array is sorted using selection sort. Show the array after each pass of the outer loop.
[16, 3, 12, 13, 8, 1, 18, 9]

Accepted Answer

16, 3, 12, 13, 8, 1, 18, 9 (initial)
1,

Question 17

The fact that the System.out.println() method is able to handle such a wide variety of objects, and print them correctly, is an example of the polymorphic nature of the println() method.

Accepted Answer

A) True 
 B)False

Question 18

Is it possible to use both overloading and overriding in the same method?

Accepted Answer

Yes. A method which is declared in a des

Question 19

A variable declared to be of one class can later reference an extended class of that class. This variable is known as

Accepted Answer

A)  protected 
B)  derivable 
C)  cloneable 
D)  polymorphic 
E)  None of these; a variable declared to be of one class can never reference any other type of class, even an extended class 
A)  protected 
B)  derivable 
C)  cloneable 
D)  polymorphic 
E)  None of these; a variable declared to be of one class can never reference any other type of class, even an extended class

Question 20

The spinner GUI control can allow the user to select values that are either numbers or strings.

Accepted Answer

A) True 
 B)False

If you instantiate an abstract class, the class or object you wind up with

A reference variable can refer to any object created from any class related to it by inheritance.

One of the advantages of the linear search is that it does not require its data to be sorted.

Code Example Ch 10-1 An int array stores the following values: 9 4 12 2 6 8 18 -Refer to Code Example Ch 10-1: Which of the following lists of numbers would accurately show the array after the first pass of the selection sort algorithm?

Polymorphism is achieved by

The type of the reference, not the type of the object, is used to determine which version of a method is invoked in a polymorphic reference.

What kind of performance can you expect if you perform a linear search on a sorted array?

We compare sorting algorithms by examining

A GUI control that allows the user to specify a numeric value within a bounded range is a spinner.

Both the insertion sort and the selection sort algorithms have efficiencies on the order of ________ where n is the number of values in the array being sorted.

Java allows one to create polymorphic references using inheritance and using interfaces.

Can a program exhibit polymorphism if it only implements early binding?

If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if C1 c = new C1(); is performed at one point of the program, then a later instruction c.whichIsIt(); will invoke the whichIsIt method defined in C1.

Write an insertion sort method to sort an array of String values (instead of an array of int values). Assume the array is an instance data of the current class called list, and number is an int instance data that stores the number of elements currently stored in list.

Demonstrate how the following array is sorted using selection sort. Show the array after each pass of the outer loop. [16, 3, 12, 13, 8, 1, 18, 9]

The fact that the System.out.println() method is able to handle such a wide variety of objects, and print them correctly, is an example of the polymorphic nature of the println() method.

Is it possible to use both overloading and overriding in the same method?

A variable declared to be of one class can later reference an extended class of that class. This variable is known as

The spinner GUI control can allow the user to select values that are either numbers or strings.

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Exceptions

Recursion

Collections

Filters

Exam 10: Polymorphism

If you instantiate an abstract class, the class or object you wind up with

A reference variable can refer to any object created from any class related to it by inheritance.

One of the advantages of the linear search is that it does not require its data to be sorted.

Code Example Ch 10-1 An int array stores the following values: 9 4 12 2 6 8 18 -Refer to Code Example Ch 10-1: Which of the following lists of numbers would accurately show the array after the first pass of the selection sort algorithm?

Polymorphism is achieved by

The type of the reference, not the type of the object, is used to determine which version of a method is invoked in a polymorphic reference.

What kind of performance can you expect if you perform a linear search on a sorted array?

We compare sorting algorithms by examining

A GUI control that allows the user to specify a numeric value within a bounded range is a spinner.

Both the insertion sort and the selection sort algorithms have efficiencies on the order of ________ where n is the number of values in the array being sorted.

Java allows one to create polymorphic references using inheritance and using interfaces.

Can a program exhibit polymorphism if it only implements early binding?

If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if C1 c = new C1(); is performed at one point of the program, then a later instruction c.whichIsIt(); will invoke the whichIsIt method defined in C1.

Write an insertion sort method to sort an array of String values (instead of an array of int values). Assume the array is an instance data of the current class called list, and number is an int instance data that stores the number of elements currently stored in list.

Demonstrate how the following array is sorted using selection sort. Show the array after each pass of the outer loop. [16, 3, 12, 13, 8, 1, 18, 9]

The fact that the System.out.println() method is able to handle such a wide variety of objects, and print them correctly, is an example of the polymorphic nature of the println() method.

Is it possible to use both overloading and overriding in the same method?

A variable declared to be of one class can later reference an extended class of that class. This variable is known as

The spinner GUI control can allow the user to select values that are either numbers or strings.

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Exceptions

Recursion

Collections

Filters