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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



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.


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


Back to Question 49

Answer 48


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

so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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