<< Chapter < Page Chapter >> Page >

Back to Question 13

Answer 12

Listing 3 . File SampProg24.java.
/*File SampProg24.java from module 50 Copyright 1997, R.G.BaldwinWithout viewing the solution that follows, Write a Java application that illustrates the fact that while a Stringobject cannot be modified, the reference variable can be modified to point to a new String object which can have theappearance of modifying the original String object. The output from this program should beDisplay original string values THIS STRING IS NAMED str1This string is named str2 Replace str1 with another stringDisplay new string named str1 THIS STRING IS NAMED str1 This string is named str2Terminating program **********************************************************/class SampProg24{ String str1 = "THIS STRING IS NAMED str1";String str2 = "This string is named str2";public static void main(String[] args){SampProg24 thisObj = new SampProg24(); System.out.println("Display original string values");System.out.println(thisObj.str1); System.out.println(thisObj.str2);System.out.println( "Replace str1 with another string");thisObj.str1 = thisObj.str1 + " " + thisObj.str2; System.out.println("Display new string named str1");System.out.println(thisObj.str1); System.out.println("Terminating program");}//end main() }//end class SampProg24

Back to Question 12

Answer 11

The first code fragment is the most efficient.

Back to Question 11

Answer 10


Back to Question 10

Answer 9

The capacity method returns the amount of space currently allocated for the StringBuffer object. The length method returns the amount of space used.

Back to Question 9

Answer 8

int num = new Integer("3625").intValue();

Back to Question 8

Answer 7

StringBuffer str6 = new StringBuffer("StringBuffer named str6".length());str6.append("StringBuffer named str6");

Back to Question 7

Answer 6

StringBuffer str5 = new StringBuffer();//accept default initial lengthstr5.append( "StringBuffer named str5");//modify length as needed

Back to Question 6

Answer 5


Back to Question 5

Answer 4

False. A String object can be instantiated using either of the following statements:

String str1 = new String("String named str2");String str2 = "String named str1";

Back to Question 4

Answer 3


Back to Question 3

Answer 2

False. This statement is backwards. The String class is used for strings that are not allowed to change. The StringBuffer class is used for strings that are modified by the program.

Back to Question 2

Answer 1

The two classes are:

  • String
  • StringBuffer

Back to Question 1


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Jb0280r Review: String and StringBuffer
  • File: Jb0280r.htm
  • Originally published: 1997
  • Published at cnx.org: 11/29/12

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.


Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
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
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?