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This module explains Java comments.

Revised: Sun Mar 27 20:34:41 CDT 2016

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Table of contents

Preface

General

This module is part of a collection of modules designed to help you learn to program computers.

It explains Java comments.

Prerequisites

In addition to an Internet connection and a browser, you will need the following tools (as a minimum) to work through the exercises in these modules:

  • The Sun/Oracle Java Development Kit (JDK) (See (External Link) )
  • Documentation for the Sun/Oracle Java Development Kit (JDK) (See (External Link) )
  • A simple IDE or text editor for use in writing Java code.

The minimum prerequisites for understanding the material in these modules include:

  • An understanding of algebra.
  • An understanding of all of the material covered in the earlier modules in this collection.

Viewing tip

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

Figures

Listings

  • Listing 1 . A multi-line comment.
  • Listing 2 . Three single-line comments.
  • Listing 3 . The program named Comments01.
  • Listing 4 . Batch file to compile and run the program named Comments01.

Discussion and sample code

Comments

Producing and using a Java program consists of the following steps:

  1. Write the source code.
  2. Compile the source code.
  3. Execute the program.

The source code consists of a set of instructions that will later be presented to a special program called a compiler for the purpose of producing a program that can be executed. In other words, when you write the source code, you are writing instructions that the compiler will use to produce the executable program.

Some things should be ignored

Sometimes, when you are writing source code, you would like to include information that may be useful to you, but should be ignored by the compiler. Information of that sort is called a comment .

Three styles of comments

Java supports the three styles of comments shown in Figure 1 .

Figure 1 . Three styles of comments.
/** special documentation comment used by the javadoc tool *//* This is a multi-line comment *///Single-line comment program code // Another single-line comment

The javadoc tool

The javadoc tool mentioned in Figure 1 is a special program that is used to produce documentation for Java programs. Comments of this style begin with /** and end with */ as shown in Figure 1 .

The compiler ignores everything in the source code that begins and ends with this pattern of characters. Documentation produced using the javadoc program is very useful for on-line oron-screen documentation.

Multi-line comments

Multi-line comments begin with /* and end with */ as shown in Figure 1 . As you have probably already guessed, the compiler also ignores everything in the source code that matches this format. (A javadoc comment is simply a multi-line comment insofar as the compiler knows. Only the special program named javadoc.exe cares about javadoc comments.)

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
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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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