Question 1

Consider the following invocation of the deposit method:
mySavings.deposit(250);
What is the explicit parameter?

Accepted Answer

A) There is no explicit parameter. 
B) deposit 
C) 250 
D) mySavings 
A) There is no explicit parameter. 
B) deposit 
C) 250 
D) mySavings

Question 2

Instance variables that are numbers are initialized to what default value?

Accepted Answer

A) Instance variables are not initialized to a default value. 
B) nil 
C) 0 
D) null 
A) Instance variables are not initialized to a default value. 
B) nil 
C) 0 
D) null

Question 3

Where do parameters and local variables belong?

Accepted Answer

A) in an object 
B) in a class 
C) in a method 
D) in a package 
A) in an object 
B) in a class 
C) in a method 
D) in a package

Question 4

We want to create a class that represents a geometric sequence.A geometric sequence is a sequence of numbers that begin at some value and then multiplies each value by some constant to get the next value.For example, the geometric sequence 1, 2, 4, 8, 16 starts at 1 and multiplies each term by 2 to get the next.The geometric sequence 10.8, 5.4, 2.7, 1.35 starts at 10.8 and multiplies each term by 0.5 to get the next.The basic framework of a geometric sequence class is below: public class Geometricsequence
{
private double currentvalue;
private double multiplier;
}
We want to create a geometric sequence using code like:
Geometricsequence first = new Geometricsequence (1,2);
// Creates 1, 2, 4, 8, 16...
Geometricsequence second = new Geometricsequence (10.8,0.5);
/ / Creates 10.8,5.4,2.7,1.35 ...
We want to produce elements of the geometric sequence using code code like:
System.out.println (first.next()); // Prints 1 and advances
System.out.println (first.next()); // Prints 2 and advances
System.out.println (first.next()); // Prints 4 and advances
System.out.println (first.next()); // Prints 8 and advances
System.out.println (second.next()); //Prints 10.8 and advances
System.out.println (second.next()); //Prints 5.4 and advances
System.out.println (second.next()); //Prints 2.7 and advances
What should the body of the next method be?

Accepted Answer

A)  double result = currentValue;
currentvalue = currentValue * multiplier;
return result; 
B)  return currentValue;
currentValue = currentValue * multiplier; 
C)  double result = currentValue;
multiplier = currentValue * multiplier;
return result; 
D)  currentValue = currentValue * multiplier;
return currentValue; 
A)  double result = currentValue;
currentvalue = currentValue * multiplier;
return result; 
B)  return currentValue;
currentValue = currentValue * multiplier; 
C)  double result = currentValue;
multiplier = currentValue * multiplier;
return result; 
D)  currentValue = currentValue * multiplier;
return currentValue;

Question 5

What is the return type of a constructor?

Accepted Answer

A) void 
B) A constructor does not have a return type. 
C) private 
D) public 
A) void 
B) A constructor does not have a return type. 
C) private 
D) public

Question 6

Which of the following corresponds to the getArea method header for a Square class assuming an integer value for a side length?

Accepted Answer

A) public int getArea 
B) public integer getArea 
C) public int getArea() 
D) public integer getArea() 
A) public int getArea 
B) public integer getArea 
C) public int getArea() 
D) public integer getArea()

Question 7

Consider the following code fragment from the Italian Flag program in How To 3.2:   Which of the following statements is true?

Accepted Answer

A) It is impossible to construct an ItalianFlagComponent because no constructor is implemented. 
B) It is impossible to add an ItalianFlagComponent object to a frame because the class does not extend JComponent. 
C) The code will not compile because it should have called g2.draw(flag); 
D) The code has a syntax error and will not compile. 
A) It is impossible to construct an ItalianFlagComponent because no constructor is implemented. 
B) It is impossible to add an ItalianFlagComponent object to a frame because the class does not extend JComponent. 
C) The code will not compile because it should have called g2.draw(flag); 
D) The code has a syntax error and will not compile.

Question 8

The use of an instance variable name inside a method denotes the instance variable of what?

Accepted Answer

A) the parameter variable 
B) the access specifier 
C) the explicit parameter 
D) the implicit parameter 
A) the parameter variable 
B) the access specifier 
C) the explicit parameter 
D) the implicit parameter

Question 9

What are the operations that any programmer can use to create and manipulate objects of the class called?

Accepted Answer

A) public implementation 
B) public interface 
C) private implementation 
D) private interface 
A) public implementation 
B) public interface 
C) private implementation 
D) private interface

Question 10

When you declare a method, you also need to provide the method ____, which consists of statements that are executed when the method is called.

Accepted Answer

A) body 
B) header 
C) return type 
D) access specifier 
A) body 
B) header 
C) return type 
D) access specifier

Question 11

Which statement describes a central benefit of information hiding?

Accepted Answer

A) Easier to change the private implementation 
B) Easier to change the method headers 
C) Easier to change the name of the class 
D) Easier to change the public interface 
A) Easier to change the private implementation 
B) Easier to change the method headers 
C) Easier to change the name of the class 
D) Easier to change the public interface

Question 12

Which special delimeter is used with the javadoc utility to document method arguments?

Accepted Answer

A) /** 
B) @param 
C) @return 
D) @javadoc 
A) /** 
B) @param 
C) @return 
D) @javadoc

Question 13

A class declaration consists of which of the following parts?

Accepted Answer

A) an access specifier, the keyword class, the name of the class, declarations for instance variables, constructors, and methods 
B) an access specifier, a return type, a method name, a list of the parameters (if any), and the body of the method 
C) the name of the class, declarations for instance variables, constructors, and methods 
D) an access specifier, the name of the class, a list of the parameters (if any), and the body of the constructor 
A) an access specifier, the keyword class, the name of the class, declarations for instance variables, constructors, and methods 
B) an access specifier, a return type, a method name, a list of the parameters (if any), and the body of the method 
C) the name of the class, declarations for instance variables, constructors, and methods 
D) an access specifier, the name of the class, a list of the parameters (if any), and the body of the constructor

Question 14

Identify the explicit parameter of the withdraw method of the BankAccount class.

Accepted Answer

A) public 
B) double 
C) balance 
D) amount 
A) public 
B) double 
C) balance 
D) amount

Question 15

We want to create a class that represents a geometric sequence.A geometric sequence is a sequence of numbers that begin at some value and then multiplies each value by some constant to get the next value.For example, the geometric sequence 1, 2, 4, 8, 16 starts at 1 and multiplies each term by 2 to get the next.The geometric sequence 10.8, 5.4, 2.7, 1.35 starts at 10.8 and multiplies each term by 0.5 to get the next.The basic framework of a geometric sequence class is below:   Which of the constructor specifications below will allow this code to behave as desired?

Accepted Answer

A) public void GeometricSequence(double initial, double mult) 
B) public GeometricSequence init(double initial, double mult) 
C) public GeometricSequence GeometricSequence(double initial, double mult) 
D) public GeometricSequence(double initial, double mult) 
A) public void GeometricSequence(double initial, double mult) 
B) public GeometricSequence init(double initial, double mult) 
C) public GeometricSequence GeometricSequence(double initial, double mult) 
D) public GeometricSequence(double initial, double mult)

Question 16

We want to create a class that represents a date.A date has a day, month, and year.For example, the date March 16, 2014 has the day 16, month 3, and year 2014.The parameter variables in the constructor for month, day, and year should be m, d and y.The basic framework of a date class is below: public class Date
{
private int day;
private int month;
private int year;
}
What should the body of the constructor be?

Accepted Answer

A)  day =d;
month =m;
year = y; 
B)  d= day;
m= month;
y= year; 
C)  Int day =d;
int month =m;
int year =y; 
D)  day =1;
month =1;
year = 1990 ; 
A)  day =d;
month =m;
year = y; 
B)  d= day;
m= month;
y= year; 
C)  Int day =d;
int month =m;
int year =y; 
D)  day =1;
month =1;
year = 1990 ;

Question 17

Consider the following invocation of the deposit method:
mySavings.deposit(250);
What is the implicit parameter?

Accepted Answer

A) deposit 
B) mySavings 
C) 250 
D) There is no implicit parameter. 
A) deposit 
B) mySavings 
C) 250 
D) There is no implicit parameter.

Question 18

Each object of a class has its own set of ___.

Accepted Answer

A) methods 
B) instance variables 
C) constructors 
D) classes 
A) methods 
B) instance variables 
C) constructors 
D) classes

Question 19

Consider the following method header for the BankAccount class:   Fill in the blank in the method body.

Accepted Answer

A) balance = balance * (1 + rate); 
B) balance = balance * rate; 
C) balance = balance * (1 + interestRate); 
D) balance = balance * interestRate; 
A) balance = balance * (1 + rate); 
B) balance = balance * rate; 
C) balance = balance * (1 + interestRate); 
D) balance = balance * interestRate;

Question 20

Which of the following statements is true about constructors?

Accepted Answer

A) Providing a constructor for a class is optional. 
B) You can only provide one constructor for a class. 
C) The body of the constructor must initialize all instance variables or the constructor will not successfully compile. 
D) A constructor has a void return type. 
A) Providing a constructor for a class is optional. 
B) You can only provide one constructor for a class. 
C) The body of the constructor must initialize all instance variables or the constructor will not successfully compile. 
D) A constructor has a void return type.

Exam 3: Implementing Classes

Consider the following invocation of the deposit method: mySavings.deposit(250); What is the explicit parameter?

Instance variables that are numbers are initialized to what default value?

Where do parameters and local variables belong?

What is the return type of a constructor?

Which of the following corresponds to the getArea method header for a Square class assuming an integer value for a side length?

Consider the following code fragment from the Italian Flag program in How To 3.2: Which of the following statements is true?

The use of an instance variable name inside a method denotes the instance variable of what?

What are the operations that any programmer can use to create and manipulate objects of the class called?

When you declare a method, you also need to provide the method ____, which consists of statements that are executed when the method is called.

Which statement describes a central benefit of information hiding?

Which special delimeter is used with the javadoc utility to document method arguments?

A class declaration consists of which of the following parts?

Identify the explicit parameter of the withdraw method of the BankAccount class.

Consider the following invocation of the deposit method: mySavings.deposit(250); What is the implicit parameter?

Each object of a class has its own set of ___.

Consider the following method header for the BankAccount class: Fill in the blank in the method body.

Which of the following statements is true about constructors?

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