Quiz 2

Question 1

What does testing an application entail?

Answer 1

Running it to see if it works correctly.

Question 2

What happens when you use both integer and double values in an arithmetic expression?

Answer 2

the integer values are cast to double values

Question 3

How many times will the while loop that follows be executed if months has a value of 5?
int i = 1;
while (i < months)
{
futureValue = futureValue * (1 + monthlyInterestRate);
i = i+1;
}

Answer 3

4

Question 4

A runtime error occurs when

Answer 4

bytecodes can’t be interpreted properly

Question 5

The double data type can be used to store

Answer 5

floating-point numbers

Question 6

According to standard naming conventions, which of the following is a typical class name?

Answer 6

Product

Question 7

What happens when a logical error occurs?

Answer 7

The results of the application will be inaccurate.

Question 8

Based on the naming recommendations in the book, which of the following is a good identifier for a variable that will be used to hold an employee’s phone number?

Answer 8

employeePhoneNumber

Question 9

Unlike other methods, a static method

Answer 9

is called directly from a class

Question 10

If a class contains a main method, that method is executed

Answer 10

when the class is run

Question 11

To refer to a Java class from an application without qualification, you need to import the class unless that class

Answer 11

is stored in a package that has already been imported

Question 12

import java.util.Scanner;

public class InvoiceApp
{
 public static void main(String[] args)
 {
 Scanner sc = new Scanner(System.in);
 String choice = "y";
 while (choice.equals("y"))
 {
 System.out.print("Enter subtotal: ");
 double subtotal = sc.nextDouble();
 double salesTax = subtotal * .0875;
 double invoiceTotal = subtotal + salesTax;
 String message = "Subtotal = " + subtotal + "\n"
 \+ " Sales tax = " + salesTax + "\n"
 \+ "Invoice total = " + invoiceTotal + "\n\n"
 System.out.println(message);
 System.out.print("Continue? Enter y or n: ");
 choice = sc.next();
 }
 }
}

(Refer to code example 2-1.) If the user enters “Y” when asked if he/she wants to continue, the application will

Answer 12

end

Question 13

Block scope means that a variable

Answer 13

can’t be used outside of the set of braces that it’s declared in

Question 14

import java.util.Scanner;

public class InvoiceApp
{
 public static void main(String[] args)
 {
 Scanner sc = new Scanner(System.in);
 String choice = "y";
 while (choice.equals("y"))
 {
 System.out.print("Enter subtotal: ");
 double subtotal = sc.nextDouble();
 double salesTax = subtotal * .0875;
 double invoiceTotal = subtotal + salesTax;
 String message = "Subtotal = " + subtotal + "\n"
 \+ " Sales tax = " + salesTax + "\n"
 \+ "Invoice total = " + invoiceTotal + "\n\n"
 System.out.println(message);
 System.out.print("Continue? Enter y or n: ");
 choice = sc.next();
 }
 }
}

(Refer to code example 2-1.) The name of the file that contains this source code must be

Answer 14

InvoiceApp.java

Question 15

The int data type can be used to store

Answer 15

whole numbers only

Question 16

What does the following statement do in a Java application?

import java.util.Scanner;

Answer 16

It makes the Scanner class available to the application without qualification.

Question 17

A compile-time error occurs when

Answer 17

there’s a syntax error in a Java statement

Question 18

What happens when a runtime error occurs?

Answer 18

The application will end abnormally.

Question 19

import java.util.Scanner;

public class InvoiceApp
{
 public static void main(String[] args)
 {
 Scanner sc = new Scanner(System.in);
 String choice = "y";
 while (choice.equals("y"))
 {
 System.out.print("Enter subtotal: ");
 double subtotal = sc.nextDouble();
 double salesTax = subtotal * .0875;
 double invoiceTotal = subtotal + salesTax;
 String message = "Subtotal = " + subtotal + "\n"
 \+ " Sales tax = " + salesTax + "\n"
 \+ "Invoice total = " + invoiceTotal + "\n\n"
 System.out.println(message);
 System.out.print("Continue? Enter y or n: ");
 choice = sc.next();
 }
 }
}

Answer 19

Subtotal = 100.0
Sales tax = 8.75
Invoice total = 108.75

Question 20

After the if statement that follows is executed, what will the value of discountAmount be?
double discountAmount = 0.0;
double orderTotal = 200.0;
if (orderTotal > 200)
 discountAmount = orderTotal * .3;
else if (orderTotal > 100) 
 discountAmount = orderTotal * .2;
else
 discountAmount = orderTotal * .1;

Answer 20

. 40.0

Question 21

What does debugging an application entail?

Answer 21

Identifying and fixing any bugs.

Question 22

Assume userName equals “Tom” and userAge equals 22. What is printed on the console when the following statement is executed?
System.out.println(userAge + “ \nis “ + userName + “‘s age.”);

Answer 22

22

is Tom’s age.

Question 23

Which of the following can you not use the Java API documentation to research?

Answer 23

debuggers

Question 24

Which of the following can you assign to a String variable?

Answer 24

all of the above

Question 25

Which of the following can you not assign to a numeric variable?

Answer 25

null