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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

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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