Question 1

Given the method defined here, which of the following method calls is legal? public void doublefoo(double x)

Accepted Answer

A)  doublefoo(0); 
B)  doublefoo(0.555); 
C)  doublefoo(0.1 + 0.2); 
D)  foo(0.1, 0.2); 
E)  all except D are legal 
A)  doublefoo(0); 
B)  doublefoo(0.555); 
C)  doublefoo(0.1 + 0.2); 
D)  foo(0.1, 0.2); 
E)  all except D are legal

Question 2

Explain why it would be a poor decision to make instance data public instead of private. Give an example of why this could result in a problem.

Accepted Answer

If the instance data are publi

Question 3

Assume method0 calls method1 and method2, method1 calls method3 which calls method4 and method5. Explain the chain of method calls (what order methods are called and from which method).

Accepted Answer

method0 calls method1 which calls method

Question 4

In a UML diagram for a class

Accepted Answer

A)  classes are represented as rectangles 
B)  there may be a section containing the name of the class 
C)  there may be a section containing the attributes of the class 
D)  there may be a section containing the methods of the class 
E)  All of these 
A)  classes are represented as rectangles 
B)  there may be a section containing the name of the class 
C)  there may be a section containing the attributes of the class 
D)  there may be a section containing the methods of the class 
E)  All of these

Question 5

Accessors and mutators provide mechanisms for controlled access to a well-encapsulated class.

Accepted Answer

A) True 
 B)False

Question 6

Class Definition Ch 04-4
public class Box
{
double length;
double width;
double height;
Box(double l, double w, double h)
{
length = l;
width = w;
height = h;
}// Box( )
double volume()
{
return length * width * height;
}// end volume()
}// end class Box
-Refer to Class Definition Ch 04-4: Write the statement to instantiate an Box object, blueBox, with a length of 6, width of 4, and height of 2.

Accepted Answer

Box blueBo

Question 7

The interface of a class is based on those data instances and methods that are declared public.

Accepted Answer

A) True 
 B)False

Question 8

Every class definition must include a constructor.

Accepted Answer

A) True 
 B)False

Question 9

A variable whose scope is restricted to the method where it was declared is known as a(n)

Accepted Answer

A)  parameter 
B)  global variable 
C)  local variable 
D)  public instance data 
E)  private instance data 
A)  parameter 
B)  global variable 
C)  local variable 
D)  public instance data 
E)  private instance data

Question 10

What happens if you declare a class constructor to have a void return type?

Accepted Answer

A)  You will most likely receive a syntax error. 
B)  The program will compile with a warning but you'll get a run-time error. 
C)  There is nothing wrong with declaring a constructor with a void return type. 
D)  The class's default constructor will be used instead of the one you're declaring. 
E)  None of these 
A)  You will most likely receive a syntax error. 
B)  The program will compile with a warning but you'll get a run-time error. 
C)  There is nothing wrong with declaring a constructor with a void return type. 
D)  The class's default constructor will be used instead of the one you're declaring. 
E)  None of these

Question 11

Class Definition Ch 04-1
import java.text.DecimalFormat;
public class Student
{
	private String name;
	private String major;
	private double gpa;
	private int hours;

public Student(String newName, String newMajor, double
                                      newGPA, int newHours)
	{
		name = newName;
		major = newMajor;
		gpa = newGPA;
		hours = newHours;
	}

public String toString()
	{
		// xxxx needs to be replaced
		DecimalFormat df = new DecimalFormat("xxxx");				return name + "
" + major + "
" + df.format(gpa)
								+ "
" + hours
	}
}

-Refer to Class Definition Ch 04-1: Which of the following could be used to instantiate a new Student s1?

Accepted Answer

A)  Student s1 = new Student(); 
B)  s1 = new Student(); 
C)  Student s1 = new Student("Jane Doe", "Computer Science", 3.333, 33); 
D)  new Student s1 = ("Jane Doe", "Computer Science", 3.333, 33); 
E)  new Student(s1); 
A)  Student s1 = new Student(); 
B)  s1 = new Student(); 
C)  Student s1 = new Student("Jane Doe", "Computer Science", 3.333, 33); 
D)  new Student s1 = ("Jane Doe", "Computer Science", 3.333, 33); 
E)  new Student(s1);

Question 12

Because an Image cannot directly be added to a container, it must be displayed using an ImageView object.

Accepted Answer

A) True 
 B)False

Question 13

Class Definition Ch 04-4
public class Box
{
double length;
double width;
double height;
Box(double l, double w, double h)
{
length = l;
width = w;
height = h;
}// Box( )
double volume()
{
return length * width * height;
}// end volume()
}// end class Box
-Refer to Class Definition Ch 04-4: Write a statement to instantiate a cube with a length of 3, width of 3, and height of 3.

Accepted Answer

Box cube =

Question 14

If a method does not have a return statement, then

Accepted Answer

A)  it will produce a syntax error when compiled 
B)  it must be a void method 
C)  it cannot be called from outside the class that defined the method 
D)  it must be defined to be a public method 
E)  it must be an int, double, float, or String method 
A)  it will produce a syntax error when compiled 
B)  it must be a void method 
C)  it cannot be called from outside the class that defined the method 
D)  it must be defined to be a public method 
E)  it must be an int, double, float, or String method

Question 15

While multiple objects of the same class can exist, in a given program there can only be one version of each class.

Accepted Answer

A) True 
 B)False

Question 16

Class Definition Ch 04-1
import java.text.DecimalFormat;
public class Student
{
	private String name;
	private String major;
	private double gpa;
	private int hours;

public Student(String newName, String newMajor, double
                                      newGPA, int newHours)
	{
		name = newName;
		major = newMajor;
		gpa = newGPA;
		hours = newHours;
	}

public String toString()
	{
		// xxxx needs to be replaced
		DecimalFormat df = new DecimalFormat("xxxx");				return name + "
" + major + "
" + df.format(gpa)
								+ "
" + hours
	}
}

-Refer to Class Definition Ch 04-1: Another method that might be desired is one that updates the student's number of credit hours. This method will receive a number of credit hours and add these to the student's current hours. Which of the following methods would accomplish this?

Accepted Answer

A)  public int updateHours()
{ return hours; } 
B)  public void updateHours()
{ hours++; } 
C)  public updateHours(int moreHours)
{ hours += moreHours; } 
D)  public void updateHours(int moreHours)
{ hours += moreHours; } 
E)  getClassRank(sq);public int updateHours(int moreHours)
{ return hours + moreHours; } 
A)  public int updateHours()
{ return hours; } 
B)  public void updateHours()
{ hours++; } 
C)  public updateHours(int moreHours)
{ hours += moreHours; } 
D)  public void updateHours(int moreHours)
{ hours += moreHours; } 
E)  getClassRank(sq);public int updateHours(int moreHours)
{ return hours + moreHours; }

Question 17

Class Definition Ch 04-4
public class Box
{
double length;
double width;
double height;
Box(double l, double w, double h)
{
length = l;
width = w;
height = h;
}// Box( )
double volume()
{
return length * width * height;
}// end volume()
}// end class Box
-Refer to Class Definition Ch 04-4: Add a constructor to class Box for a cube which has only 1 parameter, side.

Accepted Answer

Box(double s)
{
leng

Question 18

Instance data for a Java class

Accepted Answer

A)  are limited to primitive types 
B)  are limited to Strings 
C)  are limited to objects (e.g., Strings, classes defined by other programmers) 
D)  may be primitive types or objects but objects must be defined to be private 
E)  may be primitive types or objects 
A)  are limited to primitive types 
B)  are limited to Strings 
C)  are limited to objects (e.g., Strings, classes defined by other programmers) 
D)  may be primitive types or objects but objects must be defined to be private 
E)  may be primitive types or objects

Question 19

Class Definition Ch 04-3
Consider a class called Building. This class consists of a number of floors (numberOfFloors) for the building, a current floor for the elevator (current), a requested floor of a person waiting for the elevator (requestedFloor), and methods for constructing the building object, for moving the elevator one floor up, for moving the elevator one floor down, for requesting the elevator and for starting the elevator going. Assume that requestedFloor will be set to 0 if there are currently no requests being made (or the last request has already been fulfilled).
-Refer to Class Definition Ch 04-3: Write the constructor for this class.

Accepted Answer

public Building(int

Question 20

Regarding the software failure described at the Denver International Airport in the text, it is critical to factor in errors and inefficiencies that alway occur in a complex system.

Accepted Answer

A) True 
 B)False

Given the method defined here, which of the following method calls is legal? public void doublefoo(double x)

Explain why it would be a poor decision to make instance data public instead of private. Give an example of why this could result in a problem.

Assume method0 calls method1 and method2, method1 calls method3 which calls method4 and method5. Explain the chain of method calls (what order methods are called and from which method).

In a UML diagram for a class

Accessors and mutators provide mechanisms for controlled access to a well-encapsulated class.

The interface of a class is based on those data instances and methods that are declared public.

Every class definition must include a constructor.

A variable whose scope is restricted to the method where it was declared is known as a(n)

What happens if you declare a class constructor to have a void return type?

Because an Image cannot directly be added to a container, it must be displayed using an ImageView object.

If a method does not have a return statement, then

While multiple objects of the same class can exist, in a given program there can only be one version of each class.

Instance data for a Java class

Regarding the software failure described at the Denver International Airport in the text, it is critical to factor in errors and inefficiencies that alway occur in a complex system.

Introduction

Data and Expressions

Using Classes and Objects

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters

Exam 4: Writing Classes

Given the method defined here, which of the following method calls is legal? public void doublefoo(double x)

Explain why it would be a poor decision to make instance data public instead of private. Give an example of why this could result in a problem.

Assume method0 calls method1 and method2, method1 calls method3 which calls method4 and method5. Explain the chain of method calls (what order methods are called and from which method).

In a UML diagram for a class

Accessors and mutators provide mechanisms for controlled access to a well-encapsulated class.

The interface of a class is based on those data instances and methods that are declared public.

Every class definition must include a constructor.

A variable whose scope is restricted to the method where it was declared is known as a(n)

What happens if you declare a class constructor to have a void return type?

Because an Image cannot directly be added to a container, it must be displayed using an ImageView object.

If a method does not have a return statement, then

While multiple objects of the same class can exist, in a given program there can only be one version of each class.

Instance data for a Java class

Regarding the software failure described at the Denver International Airport in the text, it is critical to factor in errors and inefficiencies that alway occur in a complex system.

Introduction

Data and Expressions

Using Classes and Objects

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters