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Earlier modules have touched briefly on the topic of operators. This module discusses Java operators in depth.

Revised: Mon Mar 28 13:56:51 CDT 2016

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Table of contents

Preface

Earlier modules have touched briefly on the topic of operators . This module discusses Java operators in depth.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the listings while you are reading about them.

Listings

  • Listing 1 . Illustration of prefix and postfix notation.
  • Listing 2 . Illustration of relational operators.

Introduction

The first step in learning to use a new programming language is usually to learn the foundation concepts such as

  • variables,
  • operators,
  • types,
  • expressions,
  • flow-of-control, etc.

This module concentrates on the operators used in Java.

Operators

Unary and binary operators

Java provides a set of operators that can be used to perform an action on one, two, or three operands. An operator that operates on one operand is called a unary operator. An operator that operates on two operands is called a binary operator. An operator that operates on three operands is called a ternary operator.

Some operators can behave either as a unary or as a binary operator. The best known such operator is probably the minus sign (-) . As a binary operator, the minus sign causes its right operand to be subtracted from its left operand. As a unaryoperator, the minus sign causes the algebraic sign of the right operand to be changed.

A ternary operator

Java has only one operator that takes three operands. It is a conditional operator, which I sometimes refer to as a cheap if statement.

The first operand is a boolean expression, which is followed by a questionmark character (?) . The question mark is followed by a second operand, which is followed by a colon character (:) . The colon character is followed by the third operand.

If the boolean expression evaluates to true, the value of the operand following the ? is returned. Otherwise, the value of the operand following the : is returned.

An example of the syntax follows:

Ternary operator syntax

boolean expression ? value1 : value2

Overloaded operators

Unlike C++, Java does not support the creation of overloaded operators in program code. (If you don't know what this means, don't worry about it.)

Operators from previous programs

The statements in the following note box illustrate the use of the following operators from Java programs in earlier modules :

  • =
  • !=
  • +
  • (char)
Operators from previous programs int ch1, ch2 = '0'; while( (ch1 = System.in.read() ) != '#') ch2 = ch1;System.out.println("The char before the # was " + (char)ch2);

The plus and cast operators

Of particular interest in this list is the plus sign (+) and the cast operator (char) .

Questions & Answers

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
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
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
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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