Question 1

Choose the method header that goes with this method comment. /**
Gets the salary of the employee
@return the salary of the employee
*/
A) public void getSalary()
B) public void getSalary
C) public double getSalary()
D) public double getSalary

Accepted Answer

The method header should be `public double getSalary()`. The method comment states that the method returns the salary of the employee, so the return type of the method should be `double`. The method name should be `getSalary`, and the method should be declared as `public` so that it can be called from other classes.

Question 2

Given this method comment, fill in the blank in the method implementation. /**
Gets the current balance of the bank account
@return the current balance
*/
Public double getBalance()
{
__________ balance;
}
A) balance
B) @return
C) double
D) return

Accepted Answer

The method is supposed to return the current balance, so the correct keyword to use is "return" to return the balance value.

Question 3

Given this method implementation, fill in the blank in the method comment. /**
Gets the current balance of the bank account
_________ the current balance
*/
Public double getBalance()
{
Return balance;
}
A) return
B) double
C) @return
D) balance

Accepted Answer

The correct annotation for documenting the return value of a method in JavaDoc is @return.

Question 4

Which line of code is part of the public implementation of the BankAccount class?
A) balance = balance + amount;
B) balance = balance - amount;
C) public BankAccount(double initialBalance)
D) return balance;

Accepted Answer

The public constructor method, public BankAccount(double initialBalance), is part of the public implementation of the BankAccount class because it can be accessed and used by other classes and methods outside of the BankAccount class. The other three lines of code are private to the BankAccount class and cannot be accessed directly from outside the class.

Question 5

Complete the following tester program by choosing the line that prints the expected outcome. public class BankAccountTester
{
Public static void main(String[] args)
{
BankAccount account = new BankAccount(1000);
Account.deposit(account.getBalance());
System.out.println(account.getBalance());
___________________
}
}
A) System.out.println("Expected: 1000");
B) System.out.println("Expected: 2000");
C) System.out.println("Expected: 2000")
D) println("Expected: 2000");

Accepted Answer

The deposit method doubles the balance, so the expected outcome is 2000.

Question 6

Fill in the blank in the comment for this method header. /**
Constructs a player with the given name
_________________________________
*/
Public Player(String playerName)
) . .
A) @return the player
B) @parameter playerName the name of the player
C) @param playerName the name of the player
D) return the player

Accepted Answer

The correct tag for documenting a parameter in a method header comment is @param, followed by the parameter name and its description.

Question 7

Consider the following method header: /**
Adds interest to the bank account
_________________________________
*/
Public void addInterest(double rate)
) . .
Fill in the blank in the javadoc comment:
A) @param rate the rate of interest
B) @parameter rate the rate of interest
C) @param interestRate the rate of interest
D) @parameter interestRate the rate of interest

Accepted Answer

The correct javadoc tag for documenting a parameter is @param followed by the parameter name, which in this case is "rate".

Question 8

Given this method comment, fill in the blank in the method implementation. /**
Constructs a bank account with a given balance
@param initialBalance the initial balance
*/
Public BankAccount(double _________)
{
Balance = initialBalance;
}
A) amount
B) parameter
C) initialBalance
D) balance

Accepted Answer

The method comment specifies that the parameter name is "initialBalance," which matches the placeholder in the method signature.

Question 9

Fill in the blank in the comment for this method header. /**
Gets the interest for the bank account
_________________________________
*/
Public double getInterest()
) . .
A) @return double the interest
B) return the interest
C) @return the interest
D) return double the interest

Accepted Answer

@return is used to document the return value of a method.

Question 10

Given this method implementation, fill in the blank in the method comment. /**
Withdraws money from the bank account
_________ amount the amount to withdraw
*/
Public void withdraw(double amount)
{
Balance = balance - amount;
}
A) parameter
B) @param
C) param
D) @parameter

Accepted Answer

The correct annotation for documenting a parameter in JavaDoc comments is @param.

Question 11

Consider the following method header for the BankAccount class: public void addInterest(double rate)
{
______________________________________
}
Fill in the blank in the method body.
A) balance = balance * (1 + rate);
B) balance = balance * rate;
C) balance = balance * (1 + interestRate);
D) balance = balance * interestRate;

Accepted Answer

The method is supposed to add interest to the balance using the given rate. The correct formula to calculate the new balance after adding interest is to multiply the current balance by (1 + rate).

Question 12

What is a tester class?
A) A class that constructs objects.
B) A class that invokes one or more methods.
C) A class that is named Tester.
D) A class with a main method that contains statements to run methods of another class.

Accepted Answer

A tester class is typically a class with a main method that contains statements to run methods of another class, in order to test and verify their functionality. It is not simply a class that constructs objects (A) or invokes methods (B), and it does not necessarily have to be named "Tester" (C).

Question 13

What verifies that a class works correctly in isolation, outside a complete program?
A) unit test
B) encapsulation
C) abstraction
D) enumeration

Accepted Answer

Unit tests are designed to verify that individual units of code, such as classes, work correctly in isolation from the rest of the program.

Question 14

Which line of code is part of the private implementation of the BankAccount class?
A) public BankAccount()
B) balance = balance - amount;
C) public void deposit(double amount)
D) public void withdraw(double amount)

Accepted Answer

The line "balance = balance - amount;" is part of the private implementation of the BankAccount class because it is manipulating the balance variable, which is most likely a private instance variable of the class. The other options are public methods of the class and are part of the public interface, not the private implementation.

Question 15

The private implementation of a class consists of ___.
A) instance variables and the method headers
B) local variables and the method headers
C) parameter variables and the method bodies
D) instance variables and the implementation of the constructors and methods

Accepted Answer

The private implementation of a class includes instance variables and the implementation of constructors and methods. Instance variables represent the state of an object, while constructors and methods define the behavior of an object. Local variables and parameter variables are not part of the private implementation of a class because they are temporary and only exist within the scope of a method.

Question 16

When you declare a method, you also need to provide the method ____, which consists of statements that are executed when the method is called.
A) body
B) header
C) return type
D) access specifier

Accepted Answer

The body of a method consists of statements that are executed when the method is called, while the header includes the method name, access specifier, return type, and parameter list. Therefore, option A is the correct choice as it specifically refers to the statements within the method.

Question 17

Given this method comment, fill in the blank in the method implementation. /**
Deposits money into the bank account
@param amount the amount to deposit
*/
Public _____ deposit(double amount)
{
Balance = balance + amount;
}
A) double
B) void
C) return
D) null

Accepted Answer

The method is intended to deposit money into a bank account, which typically does not require returning a value, so the return type should be 'void'.

Question 18

Fill in the blank in the following method comment. /**
Deposits money into the bank account
@param _________ the amount to deposit
*/
Public void deposit(double amount)
{
Balance = balance + amount;
}
A) amount
B) balance
C) double amount
D) money

Accepted Answer

The @param tag is used to describe a parameter for a method. In this case, "amount" is the parameter being described, so the blank should be filled with "amount".

Question 19

Choose the method header that goes with this method comment. /**
Raises the salary of the employee
@param percentRaise salary percentage raise
*/
A) public void raiseSalary(double percent)
B) public double raiseSalary(double percent)
C) public double raiseSalary(double percentRaise)
D) public void raiseSalary(double percentRaise)

Accepted Answer

The method header should match the parameter name in the comment, which is "percentRaise", and the return type should be void as it raises the salary without returning a value.

Question 20

Consider the following method header for an Employee class: public void raiseSalary(double percentRaise)
{
______________________________________
}
Fill in the blank in the method body:
A) salary = salary * (1 + percentRaise);
B) salary = salary * percentRaise;
C) salary = salary * raise;
D) salary = salary * (1 + raise);

Accepted Answer

The correct formula to increase the salary by a percentage is to multiply the current salary by (1 + percentRaise).

Quiz 3: Implementing Classes

Choose the method header that goes with this method comment. /** Gets the salary of the employee @return the salary of the employee */

Given this method comment, fill in the blank in the method implementation. /** Gets the current balance of the bank account @return the current balance */ Public double getBalance() { __________ balance; }

Given this method implementation, fill in the blank in the method comment. /** Gets the current balance of the bank account _________ the current balance */ Public double getBalance() { Return balance; }

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

Fill in the blank in the comment for this method header. /** Constructs a player with the given name _________________________________ */ Public Player(String playerName) ) . .

Consider the following method header: /** Adds interest to the bank account _________________________________ */ Public void addInterest(double rate) ) . . Fill in the blank in the javadoc comment:

Given this method comment, fill in the blank in the method implementation. /** Constructs a bank account with a given balance @param initialBalance the initial balance */ Public BankAccount(double _________) { Balance = initialBalance; }

Fill in the blank in the comment for this method header. /** Gets the interest for the bank account _________________________________ */ Public double getInterest() ) . .

Given this method implementation, fill in the blank in the method comment. /** Withdraws money from the bank account _________ amount the amount to withdraw */ Public void withdraw(double amount) { Balance = balance - amount; }

Consider the following method header for the BankAccount class: public void addInterest(double rate) { ______________________________________ } Fill in the blank in the method body.

What is a tester class?

What verifies that a class works correctly in isolation, outside a complete program?

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

The private implementation of a class consists of ___.

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

Given this method comment, fill in the blank in the method implementation. /** Deposits money into the bank account @param amount the amount to deposit */ Public _____ deposit(double amount) { Balance = balance + amount; }

Fill in the blank in the following method comment. /** Deposits money into the bank account @param _________ the amount to deposit */ Public void deposit(double amount) { Balance = balance + amount; }

Choose the method header that goes with this method comment. /** Raises the salary of the employee @param percentRaise salary percentage raise */

Consider the following method header for an Employee class: public void raiseSalary(double percentRaise) { ______________________________________ } Fill in the blank in the method body: