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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

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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what is hormones?
Wellington
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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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