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Listing 1 . A text version of Hello World.
class TextHelloWorld{ public static void main(String[]args){ System.out.println("Text Hello World");}//end main }//end class

As mentioned above, this program does not require the use of Ericson's library. It can be compiled and executed using a batch file containing thecommands shown in Figure 5 . You should make certain that you can compile and execute this program before progressing to the graphicversion.

Note that this batch file must be placed in the same folder that contains the file named TextHelloWorld.java , and that folder must be your "current directory."

Also note that the term "-cp . " (note the space followed by a period) is probablysuperfluous on most computers. According to PATH and CLASSPATH , "The default value of the classpath is "." (note the period), meaning that ..."

Therefore, it should not be necessary to specify the classpath as "-cp . " to compile and execute the program on mostcomputers. However, on 09/10/14, I encountered a student's computer that did notcomply with the default described above and this prevented the student from being able to compile and execute the program. Including "-cp . " in the javac and java commands doesn't cause any harm. Therefore, I have updated the batch file commands shown in Figure 5 to include it. You can omit it if your computer doesn't need it.

Figure 5 . Batch file for text version of Hello World.
echo off del *.classjavac -cp . TextHelloWorld.java java -cp . TextHelloWorldpause

A graphic version of Hello World

Listing 2 contains the code for a graphic version of Hello World.

Listing 2 . A graphic version of Hello World.
import java.awt.Color; class GraphicHelloWorld{public static void main(String[] args){Picture pix = new Picture(200,100); pix.setAllPixelsToAColor(Color.RED);pix.addMessage("Graphic Hello World",15,50); pix.show();}// end main }//end class

The program shown in Listing 2 causes the image shown in Figure 6 to be displayed when the program is compiled andexecuted.

Figure 6 - Hello World in graphics.

A graphic image with the text Hello World

As mentioned above, this program does require the use of Ericson's library. It can be compiled and executed using a batch file containing thecommands shown in Figure 7 . You should make certain that you can compile and execute this program before progressing to morecomplex programs involving Ericson's library.

Note that this batch file must be placed in the same folder that contains the file named GraphicHelloWorld.java , and that folder must be your "current directory."

Figure 7 . Batch file for graphic version of Hello World. .
echo off del *.classjavac -cp .;M:\bookClasses GraphicHelloWorld.java java -cp .;M:\bookClasses GraphicHelloWorldpause

Once again, the commands shown in Figure 7 assume that the bookClasses folder is in the root directory on the M-drive. The bookClasses folder will likely be in a different location on your computer.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: The Guzdial-Ericson Multimedia Class Library
  • File: Java3000.htm
  • Published: 07/27/12
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware 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 of the module.

In the past, unknown individuals have misappropriated copies of my modules from cnx.org, converted them to Kindle books, andplaced them for sale on Amazon.com showing me as the author. I receive no compensation for those sales and don't know who doesreceive compensation. If you purchase such a book, please be aware that it is a bootleg copy of a module that is freelyavailable on cnx.org.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

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
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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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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