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Answer 40

Question 41

True or False? Everything in Java is passed and returned by reference.

Answer 41

Question 42

True or False? Each of the accessor methods shown in Listing 6 returns a copy of the reference pointing to either a Turtle object or a World object.

Listing 6 . Question 42.
public Turtle getJoe(){return joe;} public Turtle getSue(){return sue;}public World getMars(){return mars;}

Answer 42

Question 43

True or False? Code in the println method calls a method named toString on each incoming primitive value and displays the string value returned by that method.

Answer 43

Question 44

True or False? The toString method is overridden (not overloaded) in the World and Turtle classes so as to return a string value describing the object.

Answer 44

Question 45

True or False? The code in Listing 7 replaces the default all-white picture in a World object with another picture. (Note, the variable named mars contains a reference to an object of the class World .)

Listing 7 . Question 45.
public void run(){ mars.setPicture(new Picture("Prob01.jpg"));

Answer 45

Question 46

True or False? The background of a World object consists of an object of Ericson's Picture class. (A Picture object is encapsulated in the World object.)

Answer 46

Question 47

True or False? The code in Listing 8 uses two levels of indirection to add my name to the picture that forms thebackground of the world shown in Figure 1 .

Listing 8 . Question 47.
mars.getPicture().toString( "Dick Baldwin",10,20);

Figure 1 - Question 47.

Image of two turtles maneuvering in front of a background image.

Answer 47

Question 48

True or False? A Turtle object encapsulates many methods that can be used to manipulate the turtle in a variety of different ways.

Answer 48

Question 49

True or False? A call to the forward method of a turtle object with no parameters causes the turtle to move forward by a default distance of 100 pixels.

Answer 49

Question 50

True or False? A call to the moveTo method of a turtle object with a single parameter value of 150 causes the turtle to move forward by a distance of 150 pixels.

Answer 50

Figures

Listings

What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

Spacer image of a rabbit and a penguin.

This image was also inserted for the purpose of inserting space between the questions and the answers.

Spacer image of a penguin and some houses.

Answers

Answer 50

False. The moveTo method of the Turtle class cannot be called with a single parameter. Two parameters are required.

Back to Question 50

Answer 49

True.

Back to Question 49

Answer 48

True.

Back to Question 48

Answer 47

False. The code in Listing 8 won't compile. The toString method does not apply to images. The correct code is shown in Listing 9 .

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
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.
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
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
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
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
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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
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