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Learn how to use nested for loops to process pixels on a row and column basis.

Revised: Sun Apr 03 10:54:26 CDT 2016

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This module is one of a series of modules designed to teach you about Object-Oriented Programming (OOP) using Java.

The program described in this module requires the use of the Guzdial-Ericson multimedia class library. You will find download, installation, and usageinstructions for the library at Java OOP: The Guzdial-Ericson Multimedia Class Library .

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 Figures and Listings while you are reading about them.



  • Listing 1 . The driver class named Prob01.
  • Listing 2 . The constructor for the class named Prob01Runner.
  • Listing 3 . Beginning of the method named run.
  • Listing 4 . Beginning of the mirrorUpperQuads method.
  • Listing 5 . Mirror pixel colors around the midpoint.
  • Listing 6 . Remainder of the run method.
  • Listing 7 . The method named mirrorHoriz.
  • Listing 8 . Complete program listing..


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

Program specifications

Write a program named Prob01 that uses the class definition shown in Listing 1 along with Ericson's media library and the image file named Prob01.jpg to produce the graphic output images shown in Figure 1 and Figure 2 .

Figure 1 - Raw image.

Unmodified image of a beach scene.

Figure 2 - Modified image.

Mirrored image of the beach scene producing an image that looks like a beautiful lake.

Define new classes

You may define new classes as necessary to cause your program to behave as required, but you may not modify the class definition for the class named Prob01 given in Listing 1 .

Required text output

In addition to the two output images mentioned above, your program must display your name and the other line of text shown in Figure 3 on the command-line screen.

Figure 3 . Required text output.
Display your name here. Picture, filename Prob01.jpg height 240 width 320

General background information

This program mirrors an image in such a way that the image in each quadrant is a mirror image of the image in the two adjacent quadrants as shown in Figure 2 .

The top left quadrant is mirrored into the top right quadrant, and then the top half is mirrored into the bottom half.

Major evaluation areas

In order to successfully write this program, the student must be able to:

  • Examine the input and output images and determine how the input image has been modified to produce the output image.
  • Manipulate the individual pixels in the image to perform the required modifications.

Discussion and sample code

Will discuss in fragments

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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