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This module contains review questions and answers keyed to the module titled Java3010: Indirection, Array Objects, and Casting.

Revised: Sun Apr 03 10:26:37 CDT 2016

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Table of contents

Preface

This module contains review questions and answers keyed to the module titled Java3010: Indirection, Array Objects, and Casting .

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 code shown in Listing 1 produces the output shown in Figure 1 where the numeric values are random and vary from one run to the next.

Listing 1 . Question 1.
/*File Java3010ra Copyright 2013, R.G.Baldwin Rev 02/14/13*********************************************************/ import java.util.*;class Java3010ra{ public static void main(String[]args){ Random generator = new Random(new Date().getTime());int randomNumber = (byte)generator.nextInt(); Object[]objRef = [new Java3010raMyClassA(randomNumber)];System.out.println( new Java3010raMyClassB().getDataFromObj(objRef[0]));System.out.println(randomNumber); }//end main}//end class Java3010ra //======================================================//class Java3010raMyClassA extends Java3010ra{ private int data;public Java3010raMyClassA(int inData){ System.out.println("Java3010ra");System.out.println("Dick"); data = inData;}//end constructor public int getData(){return data; }//end getData()}//end class Java3010raMyClassA //======================================================//class Java3010raMyClassB{ Java3010raMyClassB(){System.out.println("Baldwin"); }//end constructorpublic int getDataFromObj(Object refToObj){ return ((Java3010raMyClassA)refToObj).getData();}//end getDataFromObj() }//end class Java3010raMyClassB
Figure 1 . Question 1.
Java3010ra DickBaldwin -37-37

Answer 1

Question 2

True or False? All array objects in Java contain one-dimensional array structures.

Answer 2

Question 3

True or False? Each array in Java is encapsulated in an array object. An array object must be accessed using a reference to the array object.

Answer 3

Question 4

True or False? When the declared type of an array is one of the eight primitive types, the actual values are stored in the array elements in the array object.

Answer 4

Question 5

True or False? When the declared type of an array is the type of an object (array object or ordinary object) , those objects are stored in the array elements.

Answer 5

Question 6

True or False? Unless code is written to do otherwise, the elements in a new array object are initialized with the standard default values for the types involved (zero, true, or null) .

Answer 6

Question 7

True or False? The array structure that is encapsulated in an array object must have one, or more elements.

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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