Question 1

What is the purpose of a clean and concise design for an object's public interface?

Accepted Answer

A) Allows the compiler to function more efficiently. 
B) Supports cross-platform independence. 
C) Allows programmers to design solutions using the object without needing to know the details of the class implementation. 
D) Eliminates the need to provide any documentation in the code. 
A) Allows the compiler to function more efficiently. 
B) Supports cross-platform independence. 
C) Allows programmers to design solutions using the object without needing to know the details of the class implementation. 
D) Eliminates the need to provide any documentation in the code. C

Question 2

Which of the following denotes the implicit parameter?

Accepted Answer

A) void 
B) this 
C) extends 
D) public 
A) void 
B) this 
C) extends 
D) public B

Question 3

When a method exits, its ____ are removed.

Accepted Answer

A) local variables 
B) classes 
C) comments 
D) instance variables 
A) local variables 
B) classes 
C) comments 
D) instance variables A

Question 4

When using index cards to help with the tracing of the execution of an object by hand, what is written on the back of the card?

Accepted Answer

A) The names of all known tester classes for the object. 
B) The key equations implemented by the constructor. 
C) A table with the values of all of the instance variables. 
D) The methods that the object can execute. 
A) The names of all known tester classes for the object. 
B) The key equations implemented by the constructor. 
C) A table with the values of all of the instance variables. 
D) The methods that the object can execute.

Question 5

Which of the following is a valid constructor header for the Player class that accepts the player name as a parameter?

Accepted Answer

A) public void Player(String playerName) 
B) private Player(playerName) 
C) private void Player(playerName) 
D) public Player(String playerName) 
A) public void Player(String playerName) 
B) private Player(playerName) 
C) private void Player(playerName) 
D) public Player(String playerName)

Question 6

Consider the following method header for an Employee class:   Fill in the blank in the method body with the implementation that will change the instance variable salary to reflect the employee's new salary after applying the raise:

Accepted Answer

A) salary = salary * (1 + percentRaise); 
B) salary = salary * percentRaise; 
C) salary = salary * raise; 
D) salary = salary * (1 + raise); 
A) salary = salary * (1 + percentRaise); 
B) salary = salary * percentRaise; 
C) salary = salary * raise; 
D) salary = salary * (1 + raise);

Question 7

We want the toString method to return strings like 3/16/2014.Give the body of the toString method.

Accepted Answer

A) return "m/d/y"; 
B) return month + "/" + day + "/" + year; 
C) return m + "/" + d + "/" + y; 
D) return "month/day/year"; 
A) return "m/d/y"; 
B) return month + "/" + day + "/" + year; 
C) return m + "/" + d + "/" + y; 
D) return "month/day/year";

Question 8

When are local variables initialized?

Accepted Answer

A) Local variables are initialized with a default value before a constructor is invoked. 
B) Local variables are initialized when the method is called. 
C) You must initialize local variables in a method body. 
D) You must initialize local variables in the constructor. 
A) Local variables are initialized with a default value before a constructor is invoked. 
B) Local variables are initialized when the method is called. 
C) You must initialize local variables in a method body. 
D) You must initialize local variables in the constructor.

Question 9

What is a parameter variable?

Accepted Answer

A) A variable that is declared in the header of a method. 
B) A variable that is declared in the body of the class. 
C) A variable that is declared in the body of a method. 
D) A variable that is declared in the header of a class. 
A) A variable that is declared in the header of a method. 
B) A variable that is declared in the body of the class. 
C) A variable that is declared in the body of a method. 
D) A variable that is declared in the header of a class.

Question 10

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;
}
Assume that the parameters to the constructor are initial and mult. What should the body of the constructor be?

Accepted Answer

A)  currentvalue = initial;
multiplier = mult; 
B)  initial = currentValue;
mult = multiplier; 
C)  double currentValue = initial;
double multiplier = mult; 
D)  double initial = currentValue;
double mult = multiplier; 
A)  currentvalue = initial;
multiplier = mult; 
B)  initial = currentValue;
mult = multiplier; 
C)  double currentValue = initial;
double multiplier = mult; 
D)  double initial = currentValue;
double mult = multiplier;

Question 11

Why is it a good idea for a programmer to write comments about a method first, before implementing it?

Accepted Answer

A) It is a good idea for complex methods, but not simple ones. 
B) It can help to assign good variable names. 
C) Without comments it is not possible to compile the code. 
D) It is an excellent test to ensure that the programmer firmly understands what is needed. 
A) It is a good idea for complex methods, but not simple ones. 
B) It can help to assign good variable names. 
C) Without comments it is not possible to compile the code. 
D) It is an excellent test to ensure that the programmer firmly understands what is needed.

Question 12

Which lines would need to be added to CarComponent to put car3 at the middle of the left side of the window?

Accepted Answer

A)  int y3=( getheight ()-30) / 2;
Car car3 = new Car (0, y3);
car3.draw (g2); 
B)  int x3=( getheight ()-30) / 2;
Car car3 = new Car (x3,0);
car3.draw (g2); 
C)  int y3 =( getWidth ()-30) / 2 ;
Car car3 = new Car (0, y3) ;
car3.draw(g2); 
D)  int x3=( getWidth ()-30) / 2 ;
Car car3 = new Car (x3,0) ;
car3.draw(g2); 
A)  int y3=( getheight ()-30) / 2;
Car car3 = new Car (0, y3);
car3.draw (g2); 
B)  int x3=( getheight ()-30) / 2;
Car car3 = new Car (x3,0);
car3.draw (g2); 
C)  int y3 =( getWidth ()-30) / 2 ;
Car car3 = new Car (0, y3) ;
car3.draw(g2); 
D)  int x3=( getWidth ()-30) / 2 ;
Car car3 = new Car (x3,0) ;
car3.draw(g2);

Question 13

You should provide documentation comments for ___.

Accepted Answer

A) only classes 
B) only methods with parameters 
C) every class, every method, every parameter, and every return value 
D) only methods with return values 
A) only classes 
B) only methods with parameters 
C) every class, every method, every parameter, and every return value 
D) only methods with return values

Question 14

Assuming the following code is the body of the deposit method, what output is generated by the valid call myAccount.deposit(1000) for an account with an initial balance of 500?

Accepted Answer

A) 1500.0 
B) The code fragment has a syntax error and does not compile. 
C) The code fragment does not compile because the parameter variable is not initialized. 
D) 1000.0 
A) 1500.0 
B) The code fragment has a syntax error and does not compile. 
C) The code fragment does not compile because the parameter variable is not initialized. 
D) 1000.0

Question 15

Choose the method header that goes with this method comment.

Accepted Answer

A) public void getSalary() 
B) public void getSalary 
C) public double getSalary() 
D) public double getSalary 
A) public void getSalary() 
B) public void getSalary 
C) public double getSalary() 
D) public double getSalary

Question 16

Choose the method header that goes with this method comment.

Accepted Answer

A) public void raiseSalary(double percent) 
B) public double raiseSalary(double percent) 
C) public double raiseSalary(double percentRaise) 
D) public void raiseSalary(double percentRaise) 
A) public void raiseSalary(double percent) 
B) public double raiseSalary(double percent) 
C) public double raiseSalary(double percentRaise) 
D) public void raiseSalary(double percentRaise)

Question 17

Which line of code is part of the public implementation of the BankAccount class?

Accepted Answer

A) balance = balance + amount; 
B) balance = balance - amount; 
C) public BankAccount(double initialBalance) 
D) return balance; 
A) balance = balance + amount; 
B) balance = balance - amount; 
C) public BankAccount(double initialBalance) 
D) return balance;

Question 18

What is the return type of the println method of the PrintStream class?

Accepted Answer

A) void 
B) public 
C) String 
D) double 
A) void 
B) public 
C) String 
D) double

Question 19

Given this method comment, fill in the blank in the method implementation.

Accepted Answer

A) amount 
B) parameter 
C) initialBalance 
D) balance 
A) amount 
B) parameter 
C) initialBalance 
D) balance

Question 20

What is the name of the constructor for the BankAccount class?

Accepted Answer

A) BankAccount 
B) deposit 
C) balance 
D) withdraw 
A) BankAccount 
B) deposit 
C) balance 
D) withdraw

Exam 3: Implementing Classes

What is the purpose of a clean and concise design for an object's public interface?

Which of the following denotes the implicit parameter?

When a method exits, its ____ are removed.

When using index cards to help with the tracing of the execution of an object by hand, what is written on the back of the card?

Which of the following is a valid constructor header for the Player class that accepts the player name as a parameter?

Consider the following method header for an Employee class: Fill in the blank in the method body with the implementation that will change the instance variable salary to reflect the employee's new salary after applying the raise:

We want the toString method to return strings like 3/16/2014.Give the body of the toString method.

When are local variables initialized?

What is a parameter variable?

Why is it a good idea for a programmer to write comments about a method first, before implementing it?

Which lines would need to be added to CarComponent to put car3 at the middle of the left side of the window?

You should provide documentation comments for ___.

Assuming the following code is the body of the deposit method, what output is generated by the valid call myAccount.deposit(1000) for an account with an initial balance of 500?

Choose the method header that goes with this method comment.

Choose the method header that goes with this method comment.

Which line of code is part of the public implementation of the BankAccount class?

What is the return type of the println method of the PrintStream class?

Given this method comment, fill in the blank in the method implementation.

What is the name of the constructor for the BankAccount class?

Introduction

Using Objects

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Input/Output and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

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Advanced Input/Output

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