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This module contains review questions and answers keyed to the module titled Jb0180: Java OOP: The main method.

Revised: Mon Mar 28 11:31:59 CDT 2016

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Table of contents


This module contains review questions and answers keyed to the module titled Jb0180: Java OOP: The main method .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.


Question 1 .

Write the method signature for the main method in a Java application.

Answer 1

Question 2

Briefly explain the reason that the main method in a Java application is declared public .

Answer 2

Question 3

Explain the reason that the main method in a Java application must be declared static .

Answer 3

Question 4

Describe the purpose of the keyword void when used as the return type for the main method.

Answer 4

Question 5

True or false? If the Java application is not designed to use command-line arguments, it is not necessary to include a formal parameter for the main method.

Answer 5

Question 6

True or false? When using command-line arguments in Java, if the name of the string array is args , the args.length variable can be used by the code in the program to determine the number of arguments actually entered.

Answer 6

Question 7

True or false? The first string in the array of command-line arguments contains the name of the Java application

Answer 7

Question 8

The controlling class of every Java application must contain a main method. Can other classes in the same application also have a main method? If not, why not? If so, why might you want to do that?

Answer 8

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.

Missing image

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

Missing image


Answer 8

Any and all classes in a Java application can have a main method. Only the one in the controlling class for the program being executed is actually called.

It is often desirable to provide a main method for a class that will not ultimately be the controlling class to allow the class to be tested in a stand-alone mode, independent of other classes.

Back to Question 8

Answer 7

False. Unlike C++, the first string in the array of command-line arguments in a Java application does not contain the name of the application.

Back to Question 7

Answer 6


Back to Question 6

Answer 5

False. The main method in a Java program must always provide the formal argument list regardless of whether it is actually used in the program.

Back to Question 5

Answer 4

The void keyword when used as the return type for any Java method indicates that the method does not return anything.

Back to Question 4

Answer 3

The keyword static indicates that the method is a class method which can be called without the requirement to instantiate an object of theclass. This is used by the Java virtual machine to launch the program by calling the main method of the class identified in the command to start the program.

Back to Question 3

Answer 2

The keyword public indicates that the method can be called by any object.

Back to Question 2

Answer 1

public static void main(String[] args)

Back to Question 1


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Jb0180r Review: The main method
  • File: Jb0180r.htm
  • Published: 11/21/12

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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

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
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
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
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.
Do you know which machine is used to that process?
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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