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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

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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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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