<< Chapter < Page Chapter >> Page >
Listing 9 . Answer 47.
mars.getPicture().addMessage( "Dick Baldwin",10,20);

Back to Question 47

Answer 46

True.

Back to Question 46

Answer 45

True.

Back to Question 45

Answer 44

True.

Back to Question 44

Answer 43

False. Code in the println method calls a method named toString on each incoming object reference and displays the string value returned by that method.

Back to Question 43

Answer 42

True.

Back to Question 42

Answer 41

False. Everything in Java is passed and returned by value , not by reference.

Back to Question 41

Answer 40

False. If there is a need to make the contents of those variables available outside the object, that should be accomplished by defining public accessor methods.

Back to Question 40

Answer 39

True.

Back to Question 39

Answer 38

False.

The default values are:

  • 0 or 0.0 for numeric variables
  • false for boolean variables
  • null for reference variables

Back to Question 38

Answer 37

True.

Back to Question 37

Answer 36

False. When an object is instantiated, the constructor returns a reference to the new object.

Back to Question 36

Answer 35

True.

Back to Question 35

Answer 34

True.

Back to Question 34

Answer 33

True.

Back to Question 33

Answer 32

False. The code in Listing 5 instantiates one object of the World class and populates that world with two objects of the Turtle class.

Back to Question 32

Answer 31

False. The three variables declared in Listing 5 are reference variables (as opposed to primitive variables) . This means that they are capable of storing references to objects as opposed to simplybeing able to store values of the eight primitive types. It also means that they are incapable of storing values of the eight primitive types.

Back to Question 31

Answer 30

True.

Back to Question 30

Answer 29

True.

Back to Question 29

Answer 28

False. Because these variables are declared private , they can only be accessed by code contained in methods defined inside the same class (and in inner classes of the class, which is beyond the scope of this module) .

Back to Question 28

Answer 27

True.

Back to Question 27

Answer 26

True.

Back to Question 26

Answer 25

True.

Back to Question 25

Answer 24

False. The method named println that is called in Listing 1 is a method belonging to a standard system object that represents the standardoutput device (usually the command-line screen) . The purpose of the println method is to display material on the command-line screen.

Back to Question 24

Answer 23

True.

Back to Question 23

Answer 22

True.

Back to Question 22

Answer 21

True.

Back to Question 21

Answer 20

False.

In general, the type of the variable must be:

  • The name of the class, or
  • The name of a superclass of the class, or
  • The name of an interface implemented by the class.

Back to Question 20

Answer 19

True.

Back to Question 19

Answer 18

False. The period ahead of the semicolon in Listing 4 says to search the current folder first.

Back to Question 18

Answer 17

False. The purpose of the classpath is to tell the compiler and the virtual machine where to look for previously compiled class files that the applicationneeds in order to successfully compile and execute.

Back to Question 17

Answer 16

True.

Back to Question 16

Answer 15

True

Back to Question 15

Answer 14

False. The Prob01.java and Prob01 at the ends of the two commands in Listing 4 specify the files being operated on by the compiler and the virtual machine respectively.

Back to Question 14

Answer 13

False. The Java compiler program is named javac.exe . The virtual machine is named java.exe .

Back to Question 13

Answer 12

True.

Back to Question 12

Answer 11

True.

Back to Question 11

Answer 10

True.

Back to Question 10

Answer 9

True.

Back to Question 9

Answer 8

False. The required command is shown in Listing 3 .

Listing 3 . Answer 8.
javac Prob01.java

Back to Question 8

Answer 7

True.

Back to Question 7

Answer 6

False. The name of the application shown in Listing 1 is Prob01 .

Back to Question 6

Answer 5

True.

Back to Question 5

Answer 4

False. Java applets do not require a method named main .

Back to Question 4

Answer 3

True.

Back to Question 3

Answer 2

False. java.awt.Color belongs to the Java standard edition class library.

Back to Question 2

Answer 1

True.

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java3002r Review: Creating and Manipulating Turtles and Pictures in a World Object
  • File: Java3002r.htm
  • Published: 02/10/13
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
what's the program
Jordan
?
Jordan
what chemical
Jordan
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?

Ask