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Answer 7

Question 8

True or False? A class must be declared abstract if it contains two or more abstract method declarations.

Answer 8

Question 9

True or False? If a class inherits an abstract method, either the subclass must be declared abstract, or it must provide a concrete overridden version ofthe inherited abstract method.

Answer 9

Question 10

True or False? The primary purpose of a constructor is to assist in the initialization of the state of an object , which depends on the values stored in its variables.

Answer 10

Question 11

True or False? The default version of the toString method is defined in the class named Class .

Answer 11

Question 12

True or False? There is an overloaded version of the println method that requires an incoming parameter of type Object . When that version of the method is called, it calls the toString method on the incoming object reference and displays the string that is returnedby the toString method. If the toString method belonging to the object has not been overridden, the default version of the toString method will be executed and the string that will be displayed is the string returned by that default version. The toString method can be overridden to cause the string that is displayed to be moreappropriate for the object. The toString method can be overridden only once in the class hierarchy.

Answer 12

Figures

Listings

  • Listing 1 . Source code for Java3008r.java.

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 the same 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 in the snow in front of some houses.

Answers

Answer 12

False. The toString method can be overridden by every class that inherits it.

Back to Question 12

Answer 11

False. The default version of the toString method is defined in the class named Object .

Back to Question 11

Answer 10

True.

Back to Question 10

Answer 9

True.

Back to Question 9

Answer 8

False. A class must be declared abstract if it contains one or more abstract method declarations.

Back to Question 8

Answer 7

True.

Back to Question 7

Answer 6

True.

Back to Question 6

Answer 5

False. The same abstract method can be overridden in different ways in different subclasses. In other words, the behavior of the overridden version canbe tailored to (be appropriate for) the class in which it is overridden.

Back to Question 5

Answer 4

True.

Back to Question 4

Answer 3

False. An abstract method has no body. Therefore, it is incomplete, has no behavior, and cannot be executed.

Back to Question 3

Answer 2

True.

Back to Question 2

Answer 1

False. Listing 1 produces the output shown in Figure 2 except that the numeric values may vary from one run to the next. Note that the toString method is not overridden in Listing 1 .

Figure 2 . Output from code in Listing 1 .
Java3008r DickJava3008rMyClass@4f1d0d 2727

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java3008r Review
  • File: Java3008r.htm
  • Published: 02/12/13
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

how do we prove the quadratic formular
Seidu Reply
hello, if you have a question about Algebra 2. I may be able to help. I am an Algebra 2 Teacher
Shirley Reply
thank you help me with how to prove the quadratic equation
Seidu
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Opoku
what is math number
Tric Reply
4
Trista
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
Need help solving this problem (2/7)^-2
Simone Reply
x+2y-z=7
Sidiki
what is the coefficient of -4×
Mehri Reply
-1
Shedrak
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
Akash
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
Carole
I'm 13 and I understand it great
AJ
I am 1 year old but I can do it! 1+1=2 proof very hard for me though.
Atone
Not really they are just easy concepts which can be understood if you have great basics. I am 14 I understood them easily.
Vedant
hi vedant can u help me with some assignments
Solomon
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
If f(x) = x-2 then, f(3) when 5f(x+1) 5((3-2)+1) 5(1+1) 5(2) 10
Augustine
how do they get the third part x = (32)5/4
kinnecy Reply
make 5/4 into a mixed number, make that a decimal, and then multiply 32 by the decimal 5/4 turns out to be
AJ
how
Sheref
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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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