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

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Answer 46


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Answer 45


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Answer 44


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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.

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Answer 42


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Answer 41

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

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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.

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Answer 39


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Answer 38


The default values are:

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

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Answer 37


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Answer 36

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

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Answer 35


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Answer 34


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Answer 33


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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.

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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.

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Answer 30


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Answer 29


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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) .

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Answer 27


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Answer 26


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Answer 25


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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.

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Answer 23


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Answer 21


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Answer 20


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.

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Answer 19


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Answer 18

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

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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.

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Answer 16


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Answer 15


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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.

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Answer 13

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

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Answer 12


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Answer 11


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Answer 10


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Answer 9


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Answer 8

False. The required command is shown in Listing 3 .

Listing 3 . Answer 8.
javac Prob01.java

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Answer 7


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Answer 6

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

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Answer 5


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Answer 4

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

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Answer 3


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Answer 2

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

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Answer 1


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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

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.


Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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