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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

what is mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
what is antagonism?
mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
what is an ionic bond
Samuel
What is Atoms
Daprince Reply
what is fallopian tube
Merolyn
what is bladder
Merolyn
what's bulbourethral gland
Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
what is heart
Konadu Reply
how is urine formed in human
Konadu
how is urine formed in human
Rahma
what is the diference between a cavity and a canal
Pelagie Reply
what is the causative agent of malaria
Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
Isaac
Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
Olalekan
a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
where does digestion begins
Achiri Reply
in the mouth
EZEKIEL
what are the functions of follicle stimulating harmones?
Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
Davonte
what are the functions of Endocrine and pituitary gland
Chinaza
endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
Achor
what's biology?
Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
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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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