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Learn to use a variety of Java2D classes including GradientPaint.

Revised: Mon Apr 04 10:05:32 CDT 2016

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Table of contents


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 Prob03.
  • Listing 2 . Beginning of the class named Prob03Runner.
  • Listing 3 . Beginning of the method named process.
  • Listing 4 . Translate the origin to the center of the image.
  • Listing 5 . Draw the black horizontal and vertical axes.
  • Listing 6 . Draw the solid green filled ellipse in the upper-left quadrant.
  • Listing 7 . Draw a circle with a gradient fill in the upper-right quadrant.
  • Listing 8 . Code for the remaining two quadrants..
  • Listing 9 . Complete program listing.


In this module you will learn to use the GradientPaint class along with a variety of other Java2D classes.

Program specifications

Write a program named Prob03 that uses the class definition shown in Listing 1 and Ericson's media library along with the image file named Prob03.jpg to produce the graphic output image shown in Figure 1 . (Note that the image in the file named Prob03.jpg is a blank white image. You could also create thisblank image using one of the constructors for the Picture class.)

Figure 1 - Required graphic output.

Image showing four circles with different gradient patterns in each circle.

Circles with gradient paint

The program draws four circles in the quadrants of a Cartesian coordinate system. One is filled with solid green. The other three are filled with cyclicgradient paint from green to blue.

The number of cycles varies in each circle, as do the axes along which the gradient occurs.

The background is set to Color.RED.

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 Prob03 shown in Listing 1 .

Required text output

In addition to the output image mentioned above, your program must display your name and the other line of text shown in Figure 2 .

Figure 2 - Required text output.
Display your name here. Picture, filename Prob03.jpg height 300 width 300

Discussion and sample code

Will discuss in fragments

I will discuss and explain this program in fragments. A complete listing of the program is provided in Listing 9 near the end of the module.

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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