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This module discusses the String and StringBuffer classes in detail.

Revised: Tue Mar 29 11:14:56 CDT 2016

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Preface

This module discusses the String and StringBuffer classes in detail.

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Listings

Introduction

A string in Java is an object. Java provides two different string classes from which objects that encapsulate string data can beinstantiated:

  • String
  • StringBuffer

The String class is used for strings that are not allowed to change once an object has been instantiated (an immutable object) . The StringBuffer class is used for strings that may be modified by the program.

You can't modify a string object, but you can replace it

While the contents of a String object cannot be modified, a reference to a String object can be caused to point to a different String object as illustrated in the sample program shown in Listing 1 . Sometimes this makes it appear that the original String object is being modified.

Listing 1 . File String01.java.
/*File String01.java Copyright 1997, R.G.Baldwin This application 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 havethe appearance of modifying the original String object. The program was tested using JDK 1.1.3 under Win95.The output from this program is Display original string valuesTHIS STRING IS NAMED str1 This string is named str2Replace str1 with another string Display new string named str1THIS STRING IS NAMED str1 This string is named str2 Terminating program**********************************************************/ class String01{String str1 = "THIS STRING IS NAMED str1"; String str2 = "This string is named str2";public static void main(String[]args){ String01 thisObj = new String01();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 String01

Questions & Answers

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
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
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
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 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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