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Learn how to create and manipulate Turtle objects and Picture objects in a World object using the Guzdial-Ericson multimedia library.

Revised: Sat Apr 02 13:20:42 CDT 2016

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Table of contents

Preface

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

Before embarking on the material in this module, you should have studied and should understand all of the material in the modules identified as Java1600 through Java1630 in the section of this book titled Essence of OOP and you should have studied and should understand allof the material in the following books:

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.

Figures

  • Figure 1 . Graphic screen output.
  • Figure 2 . Command-line output.
  • Figure 3 . Commands to compile and execute the application.
  • Figure 4 . Constructors for the World class.
  • Figure 5 . Constructors for the Turtle class.
  • Figure 6 . Constructors for the Picture class.

Listings

Preview

In this module, I will explain a program that uses Java and Ericson's media library to (see Figure 1 ) :

  • Add a picture and two turtles to a world.
  • Manipulate the turtles, their colors, and their pens.

Stated in more detail, the program will:

  • Create a Picture object from an image file and replace the default white Picture in a World object with the new Picture object.
  • Place two Turtle objects in a World object.
  • Apply a series of operations to manipulate the two turtle objects so as to produce a specific graphic output.
  • Provide accessor methods to get references to two Turtle objects and the World object.
  • Use the references to get information from the World and Turtle objects and display that information on the command-line screen.
  • Display text on a Picture in a World object.

Program output

Figure 1 shows the graphic screen output produced by this program.

Figure 1 - Graphic screen output.

Image of two turtles maneuvering in front of a background image.

Figure 2 shows the text output produced by the program on the command line screen.

Figure 2 . Command-line output.
javac 1.6.0_14 java version "1.6.0_14"Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode,sharing) Dick Baldwin.A 300 by 274 world with 2 turtles in it. joe turtle at 44, 143 heading -135.0.sue turtle at 250, 237 heading 0.0.

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?
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cm
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Can you compute that for me. Ty
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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
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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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Samuel Reply
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
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answer
Magreth
progressive wave
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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?
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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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