Java

Front 1

1.
Which of the following is true?

Back 1

A) Java programs can run on different platforms, like Windows and Unix, without being recompiled.

Front 2

2.
What kind of Java program runs within a Java-enabled browser?

Back 2

B) an applet

Front 3

3.
Bytecodes are

Back 3

D) input to the Java interpreter

Front 4

4.
To achieve platform independence, the Java virtual machine

Back 4

B) interprets the bytecodes

Front 5

5.
Which of the following isn’t a benefit of a typical IDE for Java?

Back 5

D) Your code compiles and runs faster.

Front 6

6.
Which of the following is not true of using a IDE to develop Java programs?

Back 6

D) It’s harder to detect syntax errors.

Front 7

7.
The NetBeans IDE stores all of the files for an application in a

Back 7

C) project

Front 8

8.
In NetBeans, the class that contains the main method for an application is known as the

Back 8

B) main class

Front 9

9.
In NetBeans, what tool do you use to enter and edit source code?

Back 9

D) code editor

Front 10

10.
To create a Java source file, you use a

Back 10

A) text editor

Front 11

11.
The extension for a Java source file is

Back 11

D) java

Front 12

12.
As you develop a Java program, you can use NetBeans to

Back 12

A) enter and edit the source code
B) compile the source code
C) run the application
D) all of the above

Front 13

13.
Since NetBeans does this automatically, you typically don’t need to

Back 13

A) compile/build a project
Correct Answer(s): A

Front 14

14.
What window does NetBeans use to get input from a console application?

Back 14

B) the Output window

Front 15

15.
When you have two or more projects open in NetBeans, you can make it easier to run one project by setting it as the

Back 15

C) main project

Front 16

16.
What dialog box do you use to set the Java version for a project?

Back 16

D) the Project Properties dialog box

Front 17

17.
What NetBeans feature can help you enter a method by displaying a list of methods that are available from an object or class?

Back 17

A) the code completion feature

Front 18

18.
A syntax error occurs when

Back 18

C) a statement won't compile

Front 19

19.
When NetBeans detects a statement that has a syntax error, what does it do?

Back 19

B) it places a red wavy line under the statement

Front 20

20.
You typically use comments in a Java application to

Back 20

A) describe statements that are difficult to understand

Front 21

21.
Which of the following is a valid variable name?

Back 21

A) salesTax

Front 22

22.
Which of the following is a valid class name?

Back 22

C) CustomerMaintApp

Front 23

23.
According to standard naming conventions, which of the following is a typical class name?

Back 23

C) Product

Front 24

24.
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?

Back 24

C) employeePhoneNumber

Front 25

25.
Which of the following can you not assign to a numeric variable?

Back 25

B) null

Front 26

26.
Which of the following is a valid statement for declaring and initializing a double variable named length to a starting value of 120?

Back 26

C) double length = 120.0;

Front 27

27.
To refer to a Java class from an application without qualifying

Back 27

C) you need to import the class.

Front 28

28.
What does the following statement do in a Java application?
import java.util.Scanner;

Back 28

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

Front 29

29.
Which of the following can you not use the Java API documentation to research?

Back 29

C) debuggers

Front 30

30.
You can use a Scanner object to:

Back 30

A) get data from the console

Front 31

31.
You can use a System.out object to:

Back 31

C) display a blank line on a console

Front 32

32.
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.");

Back 32

B) 22
is Tom's age.
Correct Answer(s): B

Front 33

33.
You can use relational operators to

Back 33

B) compare numeric variables

Front 34

34.
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;

Back 34

C) 40.0

Front 35

35.
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;
}

Back 35

B) 4

Front 36

36.
Block scope means that a variable

Back 36

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

Front 37

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();
}
}
}

Back 37

B) InvoiceApp.java

Front 38

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 100 the first time the while loop is executed, what will the program display at the console?

Back 38

D) Subtotal = 100.0
Sales tax = 8.75
Invoice total = 108.75
Points Earned: 1.0/1.0
Correct Answer(s): D

Front 39

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

Back 39

C) end
Points Earned: 0.0/1.0
Correct Answer(s): C

Front 40

40.
A runtime error occurs when

Back 40

B) bytecodes can’t be interpreted properly

Front 41

41.
A compile-time error occurs when

Back 41

C) there’s a syntax error in a Java statement
Correct Answer(s): C