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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

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Answer 11

The first code fragment is the most efficient.

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Answer 10

True.

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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.

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Answer 8

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

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Answer 7

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

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Answer 6

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

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Answer 5

True.

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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";

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Answer 3

True.

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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.

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Answer 1

The two classes are:

  • String
  • StringBuffer

Back to Question 1

Miscellaneous

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
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
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
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
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
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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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