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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

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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