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Very similar to an earlier method

This method is very similar to the method named mirrorUpperQuads that I explained in Listing 4 and Listing 5 . If you understood that explanation, you should have no difficulty understanding the code in Listing 7 without further explanation.

End of Prob01Runner class

Listing 7 also signals the end of the class named Prob01Runner .

Run the program

I encourage you to copy the code from Listing 8 . Compile the code and execute it. Experiment with the code, making changes, andobserving the results of your changes. Make certain that you can explain why your changes behave as they do.

Click here to download the required input image file.


In this module, you learned how to use nested for loops to process pixels on a row and column basis.

What's next?

You will learn to crop, flip, and combine pictures in the next module.

While not a requirement of the course, you can select the following links to view optional online video lectures on the material in thismodule.


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: Using Nested Loops to Process Pixels
  • File: Java3012.htm
  • Published: 07/31/12

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 copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

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

Complete program listing

A complete listing of the program discussed in this module is shown in Listing 8 below.

Listing 8 . Complete program listing.
/*File Prob01 Copyright 2008 R.G.Baldwin Revised 12/16/08*********************************************************/ public class Prob01{public static void main(String[] args){Picture pic = new Prob01Runner().run(); System.out.println(pic);}//end main method }//end class Prob01//======================================================// class Prob01Runner{public Prob01Runner(){ System.out.println("Display your name here.");}//end constructor //----------------------------------------------------//public Picture run(){ Picture pix = new Picture("Prob01.jpg");//Display the input picture. pix.explore();//Call the mirrorUpperQuads method to modify the top // half of the picture.pix = mirrorUpperQuads(pix); //Mirror the top half into the bottom half.pix = mirrorHoriz(pix); //Add your name and display the output picture.pix.addMessage("Display your name here.",10,20); pix.explore();return pix; }//end run//----------------------------------------------------// //This method mirrors the upper-left quadrant of a// picture into the upper-right quadrant. private Picture mirrorUpperQuads(Picture pix){Pixel leftPixel = null; Pixel rightPixel = null;int midpoint = pix.getWidth()/2; int width = pix.getWidth();for(int row = 0;row<pix.getHeight()/2;row++){ for(int col = 0;col<midpoint;col++){ leftPixel = pix.getPixel(col,row);rightPixel = pix.getPixel(width-1-col,row);rightPixel.setColor(leftPixel.getColor()); }//end inner loop}//end outer loop return pix;}//end mirrorUpperQuads //----------------------------------------------------////This method mirrors the top half of a picture into // the bottom half.private Picture mirrorHoriz(Picture pix){ Pixel topPixel = null;Pixel bottomPixel = null; int midpoint = pix.getHeight()/2;int height = pix.getHeight(); for(int col = 0;col<pix.getWidth();col++){ for(int row = 0;row<midpoint;row++){ topPixel = pix.getPixel(col,row);bottomPixel = pix.getPixel(col,height-1-row);bottomPixel.setColor(topPixel.getColor()); }//end inner loop}//end outer loop return pix;}//end mirrorHoriz //----------------------------------------------------//}//end class Prob01Runner


Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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