Question 1

Java methods can only return primitive types.

Accepted Answer

A) True 
 B)False  False

Question 2

Consider a Rational class designed to represent rational numbers as a pair of ints, along with methods reduce (to reduce the rational to simplest form), gcd (to find the greatest common divisor of two ints), as well as methods for addition, subtraction, multiplication, and division. Why should the reduce and gcd methods be declared to be private?

Accepted Answer

A)  because they will never be used 
B)  because they will only be called from methods inside Rational 
C)  because they will only be called from the constructor of Rational 
D)  because they do not use any of the Rational instance data 
E)  This is incorrect; they should be declared as public 
A)  because they will never be used 
B)  because they will only be called from methods inside Rational 
C)  because they will only be called from the constructor of Rational 
D)  because they do not use any of the Rational instance data 
E)  This is incorrect; they should be declared as public B

Question 3

Having multiple class methods of the same name where each method has a different number of or type of parameters is known as

Accepted Answer

A)  encapsulation 
B)  information hiding 
C)  tokenizing 
D)  importing 
E)  method overloading 
A)  encapsulation 
B)  information hiding 
C)  tokenizing 
D)  importing 
E)  method overloading E

Question 4

The software failure at the Denver International Airport's baggage handling system is a good example of

Accepted Answer

A)  how a large system can be obsolete by the time it is developed 
B)  how designers sometimes have too much faith in the technology they are using 
C)  how failures are often a result of multiple variables caused by a system as a whole in actual operation 
D)  how the use of a centralized computer is unrealistic in today's distributed processing 
E)  All of these 
A)  how a large system can be obsolete by the time it is developed 
B)  how designers sometimes have too much faith in the technology they are using 
C)  how failures are often a result of multiple variables caused by a system as a whole in actual operation 
D)  how the use of a centralized computer is unrealistic in today's distributed processing 
E)  All of these

Question 5

Class Definition Ch04-2
The following is from a class named BaseballPlayer. It contains the following data instances:
private String name;
private String position;
private int numAtBats;
private int numSingles;
private int numDoubles;
private int numTriples;
private int numHomeRuns;
private double battingAverage;
-Refer to Class Definition Ch 04-2: Write the constructor which is passed the player's name and position.

Accepted Answer

Notice that we not only initialize the i

Question 6

In order to preserve encapsulation of an object, we would do all of the following except for which one?

Accepted Answer

A)  make the instance data private 
B)  define the methods in the class to access and manipulate the instance data 
C)  make the methods of the class public 
D)  make the class final 
E)  all of these preserve encapsulation 
A)  make the instance data private 
B)  define the methods in the class to access and manipulate the instance data 
C)  make the methods of the class public 
D)  make the class final 
E)  all of these preserve encapsulation

Question 7

The following method header definition will result in a syntax error:
public void aMethod();

Accepted Answer

A) True 
 B)False

Question 8

The behavior of an object is defined by the object's

Accepted Answer

A)  instance data 
B)  constructor 
C)  visibility modifiers 
D)  methods 
E)  All of these 
A)  instance data 
B)  constructor 
C)  visibility modifiers 
D)  methods 
E)  All of these

Question 9

Given the method defined here, which of the following method calls is legal? public void foo(int a, int b)

Accepted Answer

A)  foo(0, 0.1); 
B)  foo(0/1, 2*3); 
C)  foo(0); 
D)  foo(); 
E)  foo(1+2, 3*0.1); 
A)  foo(0, 0.1); 
B)  foo(0/1, 2*3); 
C)  foo(0); 
D)  foo(); 
E)  foo(1+2, 3*0.1);

Question 10

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 output the volume of the blue box.

Accepted Answer

System.out.println("

Question 11

Formal parameters are those that appear in the method call and actual parameters are those that appear in the method header.

Accepted Answer

A) True 
 B)False

Question 12

A constructor may contain a return statement so long as no value (or expression) is returned.

Accepted Answer

A) True 
 B)False

Question 13

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 patterns should be used in place of "xxxx" when instantiating df so that the gpa to be output is in typical form (like 3.810)?

Accepted Answer

A)  "#.###" 
B)  "#.0" 
C)  "0.#" 
D)  "0.000" 
E)  "0.0##" 
A)  "#.###" 
B)  "#.0" 
C)  "0.#" 
D)  "0.000" 
E)  "0.0##"

Question 14

When reasoning about a car, we use such information as its make and model, year, color, cost (or worth), number of miles, gas mileage, insurance cost, and so forth. Consider a program that will attempt to determine how practical a car might be on a road trip. Which of these types of information might you use in your program as instance data? Provide a justification for your selection.

Accepted Answer

Because a road trip will include such fa

Question 15

A GUI control sets up an event but it is the programmer who writes the code for the event handler which executes when an event occurs.

Accepted Answer

A) True 
 B)False

Question 16

Consider a sequence of method invocations as follows: main calls m1, m1 calls m2, m2 calls m3, and then m2 calls m4, m3 calls m5. If m4 has just terminated, what method will resume execution?

Accepted Answer

A)  m1 
B)  m2 
C)  m3 
D)  m5 
E)  main 
A)  m1 
B)  m2 
C)  m3 
D)  m5 
E)  main

Question 17

To define a class that will represent a car, which of the following definition is most appropriate?

Accepted Answer

A)  private class car 
B)  public class car 
C)  public class Car 
D)  public class CAR. 
E)  private class Car 
A)  private class car 
B)  public class car 
C)  public class Car 
D)  public class CAR. 
E)  private class Car

Question 18

An object should be encapsulated in order to guard its data and methods from inappropriate access.

Accepted Answer

A) True 
 B)False

Question 19

A method defined in a class can access the class's instance data without needing to pass them as parameters or declare them as local variables.

Accepted Answer

A) True 
 B)False

Question 20

A class's constructor usually defines

Accepted Answer

A)  how an object is initialized 
B)  how an object is interfaced 
C)  the number of instance data in the class 
D)  the number of methods in the class 
E)  if the instance data are accessible outside of the object directly 
A)  how an object is initialized 
B)  how an object is interfaced 
C)  the number of instance data in the class 
D)  the number of methods in the class 
E)  if the instance data are accessible outside of the object directly

Java methods can only return primitive types.

Having multiple class methods of the same name where each method has a different number of or type of parameters is known as

The software failure at the Denver International Airport's baggage handling system is a good example of

In order to preserve encapsulation of an object, we would do all of the following except for which one?

The following method header definition will result in a syntax error: public void aMethod();

The behavior of an object is defined by the object's

Given the method defined here, which of the following method calls is legal? public void foo(int a, int b)

Formal parameters are those that appear in the method call and actual parameters are those that appear in the method header.

A constructor may contain a return statement so long as no value (or expression) is returned.

A GUI control sets up an event but it is the programmer who writes the code for the event handler which executes when an event occurs.

Consider a sequence of method invocations as follows: main calls m1, m1 calls m2, m2 calls m3, and then m2 calls m4, m3 calls m5. If m4 has just terminated, what method will resume execution?

To define a class that will represent a car, which of the following definition is most appropriate?

An object should be encapsulated in order to guard its data and methods from inappropriate access.

A method defined in a class can access the class's instance data without needing to pass them as parameters or declare them as local variables.

A class's constructor usually defines

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

Java methods can only return primitive types.

Having multiple class methods of the same name where each method has a different number of or type of parameters is known as

The software failure at the Denver International Airport's baggage handling system is a good example of

In order to preserve encapsulation of an object, we would do all of the following except for which one?

The following method header definition will result in a syntax error: public void aMethod();

The behavior of an object is defined by the object's

Given the method defined here, which of the following method calls is legal? public void foo(int a, int b)

Formal parameters are those that appear in the method call and actual parameters are those that appear in the method header.

A constructor may contain a return statement so long as no value (or expression) is returned.

A GUI control sets up an event but it is the programmer who writes the code for the event handler which executes when an event occurs.

Consider a sequence of method invocations as follows: main calls m1, m1 calls m2, m2 calls m3, and then m2 calls m4, m3 calls m5. If m4 has just terminated, what method will resume execution?

To define a class that will represent a car, which of the following definition is most appropriate?

An object should be encapsulated in order to guard its data and methods from inappropriate access.

A method defined in a class can access the class's instance data without needing to pass them as parameters or declare them as local variables.

A class's constructor usually defines

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