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This module contains review questions and answers keyed to the module titled Jb0190: Java OOP: Using the System and PrintStream Classes

Revised: Mon Mar 28 11:58:41 CDT 2016

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Table of contents

Preface

This module contains review questions and answers keyed to the module titled Jb0190: Java OOP: Using the System and PrintStream Classes .

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.

Questions

Question 1 .

True or false? The main method in the controlling class of a Java application controls the flow of the program.

Answer 1

Question 2

True or false? The main method cannot access the variables and methods of objects instantiated from other classes.

Answer 2

Question 3

True or false? The main method must instantiate objects of other classes in order for the program to execute.

Answer 3

Question 4

True or false? In order to be useful, the System class must be used to instantiate objects in a Java application.

Answer 4

Question 5

True or false? Class variables such as the out variable of the System class must be of some specific type.

Answer 5

Question 6

True or false? Class variables must be of a primitive type such as int or float .

Answer 6

Question 7

True or false? The out variable in the System class is of a primitive type.

Answer 7

Question 8

What does the following code fragment access?

System.out

Answer 8

Question 9

True or false? An object of type PrintStream is automatically instantiated when the System class is loaded into an application.

Answer 9

Question 10

True or false? The out variable in the System class refers to an instance of what class?

Answer 10

Question 11

True or false? The println method is an instance method of what class?

Answer 11

Question 12

What is the primary behavior of the println method?

Answer 12

Question 13

How can the println method be accessed?

Answer 13

Question 14

Assuming that the standard output device has not been redirected, write a code fragment that will cause your name to be displayed onthe screen.

Answer 14

Question 15

Explain how your code fragment in Answer 14 produces the desired result.

Answer 15

Question 16

If you have a class named MyClass that has a class variable named myClassVariable that requires four bytes of memory and you instantiate ten objects of type MyClass , how much total memory will be allocated to contain the allocated variables (assume that the class definition contains no other class, instance, or local variables) .

Answer 16

Question 17

How many actual instances of the variable named out are allocated in memory by the following code fragment?

System.out.println("Dick Baldwin");

Answer 17

Question 18

If you have a class named MyClass that has an instance variable named myInstanceVariable that requires four bytes of memory and you instantiate ten objects of type MyClass , how much total memory will be allocated to contain the allocated variables (assume that the class definition contains no other class, instance, or local variables) .

Questions & Answers

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
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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