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This module contains review questions and answers keyed to the module titled Java3026: GradientPaint and other Java2D Classes.

Revised: Mon Apr 04 10:22:57 CDT 2016

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Table of contents

Preface

This module contains review questions and answers keyed to the module titled Java3026: GradientPaint and other Java2D Classes .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.

Questions

Question 1 .

Which of the following output images is produced by the program shown in Listing 1 ?

A. Figure 1

B. Figure 2

Listing 1 . Question 1 .
/*File Java3026ra Copyright 2013 R.G.Baldwin *********************************************************/import java.awt.geom.Line2D; import java.awt.geom.Ellipse2D;import java.awt.Color; import java.awt.Graphics;import java.awt.Graphics2D; import java.awt.GradientPaint;public class Java3026ra{ public static void main(String[]args){ new Java3026raRunner().run();}//end main method }//end class Java3026ra//======================================================// class Java3026raRunner{public void run(){ Picture pic = new Picture(300,300);pic.setAllPixelsToAColor(Color.RED); process(pic);pic.explore(); }//end run//----------------------------------------------------// private void process(Picture pic){Graphics2D g2 = (Graphics2D)(pic.getGraphics()); int width = pic.getWidth();int height = pic.getHeight(); g2.translate(width/2,height/2);g2.setColor(Color.BLACK); g2.draw(new Line2D.Double(-width/2,0.0,width/2,0.0));g2.draw(new Line2D.Double(0.0,-width/2,0.0,height/2)); Ellipse2D.Double circle1 =new Ellipse2D.Double(-128,-128,128,128); g2.setPaint(new GradientPaint(-64,-64,Color.BLUE,-32,-32,Color.GREEN,true)); g2.fill(circle1);g2.draw(circle1); Ellipse2D.Double circle2 =new Ellipse2D.Double(0.0,-128,128,128); g2.fill(circle2);g2.draw(circle2); Ellipse2D.Double circle3 =new Ellipse2D.Double(-128,0.0,128,128); g2.fill(circle3);g2.draw(circle3); Ellipse2D.Double circle4 =new Ellipse2D.Double(0,0,128,128); g2.fill(circle4);g2.draw(circle4); }//end process}//end class Java3026raRunner

Figure 1 - Possible output image.

Possible output image from the program in Listing 1.

Figure 2 - Possible output image.

Possible output image from the program in Listing 1.

Answer 1

Figures

Listings

What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

Spacer image of a rabbit and a penguin.

This image was also inserted for the purpose of inserting space between the questions and the answers.

Spacer image of a penguin in the snow in front of some houses.

Answers

Answer 1

The code in Listing 1 produces the output image shown in Figure 1 .

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java3026r Review
  • File: Java3026r.htm
  • Published: 02/18/13
Disclaimers:

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I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

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

-end-

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
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what is physics
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
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what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
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answer
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progressive wave
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fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
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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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