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Note however, that this array object doesn't contain the actual string data. Rather, it simply sets aside memory for storage of two references to String objects. No memory has been set aside to store the characters that make up the individual strings. You must allocate the memory for the actual String objects separately using code similar to the following.

myArrayOfStringReferences[0] = new String("This is the first string."); myArrayOfStringReferences[1]= new String( "This is the second string.");

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Answer 16

Java supports string concatenation using the overloaded + operator as shown in the following code fragment:

"My variable has a value of " + myVar + " at this point in the program."

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Answer 15

String objects cannot be modified once they have been created. StringBuffer objects can be modified

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Answer 14

The Java compiler considers a series of characters surrounded by quotation marks to be a literal string, as in the following code fragment:

"This is a literal string in Java."

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Answer 13

A string is commonly considered to be a sequence of characters stored in memory and accessible as a unit. Java implements strings using the String class and the StringBuffer class.

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Answer 12

Java allows you to assign one array to another. When you do this, you are simply making another copy of the reference to the same data in memory. Then youhave two references to the same data in memory. This is illustrated in the program named array02.java in Jb0240: Java OOP: Arrays and Strings .

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Answer 11

False. When declaring a two-dimensional array, it is not necessary to declare the size of the secondary dimension when the array is declared. Declaration ofthe size of each sub-array can be deferred until later as illustrated in the program named array01.java in Jb0240: Java OOP: Arrays and Strings .

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Answer 10

False. Java can be used to produce multi-dimensional arrays that can be viewed as an array of arrays. However, the secondary arrays need not all be ofthe same size. See the program named array01.java in Jb0240: Java OOP: Arrays and Strings .

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Answer 9

Array objects can contain any Java data type including primitive values, references to ordinary objects, and references to other array objects.

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Answer 8

All array objects have a length property that can be accessed to determine the number of elements in the array as shown below.

for(int cnt = 0; cnt<myArray.length; cnt++) myArray[cnt]= cnt;

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Answer 7

False. Array indices always begin with 0.

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Answer 6

False. While it is possible to simultaneously declare the name of the variableand cause memory to be allocated to contain the array object, it is not necessary tocombine these two processes. You can execute one statement to declare the variableand another statement to cause the memory for the array object to be allocated as shown below.

int[] myArray;. .. myArray = new int[25];

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Answer 5

False. As with other objects. the declaration of the variable does not allocate memory to contain the array object. Rather it simply allocates memory tocontain a reference to the array object. Memory to contain the array object must be allocated from dynamic memory using statements such as the following.

int[] myArray = new int[15]; int myArray[]= new int[25];int[] myArray = {1,2,3,4,5}

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Answer 4

int[] myArray;int myArray[];

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Answer 3

In declaring the variable, you must provide two important pieces of information:

  • the name of the variable
  • the type of the variable, which indicates the type of data to be stored in the array

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Answer 2

False. Java has a true array type and a true String type with protective features to prevent your program from writing outside the memorybounds of the array or the String .

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Answer 1

True.

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Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Jb0240r Review: Arrays and Strings
  • File: Jb0240r.htm
  • Originally published: 1997
  • Published at cnx.org: 11/26/12
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
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
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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