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Using Jeroo To Teach Object-Oriented Concepts

Using Jeroo To Teach Object-Oriented Concepts. By Christian Digout. What is Jeroo ?. A tool for helping students learn object-oriented concepts including : Instantiating and using objects Constructors Writing methods to extend behavior Information Hiding. Jeroo Layout.

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Using Jeroo To Teach Object-Oriented Concepts

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  1. Using JerooTo Teach Object-Oriented Concepts By Christian Digout

  2. What is Jeroo? • A tool for helping students learn object-oriented concepts including: • Instantiating and using objects • Constructors • Writing methods to extend behavior • Information Hiding

  3. Jeroo Layout

  4. Example of a Program

  5. Features of the Jeroo Application • Animation showing Jeroos moving around the island • Source code highlighting synchronized with execution • Stepwise or continuous execution mode • Choice of execution speeds • Ability to switch between execution modes and change speeds at will • Error messages

  6. Summary of Jeroo • Small Object-Oriented Language • Only one class, the Jeroo class • Can instantiate up to four Jeroos • Three attributes per Jeroo • location • direction • number of flowers

  7. Summary of Jeroo • Six constructors to initialize the attributes • Seven action methods • Seven sensor methods to examine the immediate surroundings • Four relative directions

  8. Instantiation • The process of creating an instance of an object. • Jeroo has 6 constructors • Including a default constructor • The new operator is used to instantiate objects

  9. Constructors

  10. Objects and Jeroo • States (or member variables) • Position (x, y) • Direction (North, East, South, West) • Number of flowers • Information Hiding • A Jeroo’s data is protected • Protects data integrity • Need to use member methods to access member variables

  11. Behavior and Member Methods

  12. Behaviors and Member Members

  13. Student Assignments • From the Jeroo website: • Pick All Flowers • The Maze • Walk the Lake • http://home.cc.gatech.edu/dorn/48

  14. Jeroo • Use of constructors • Get use to the dot-notation • Use member methods • Can extend the Jeroo class with new methods

  15. Java – Building a Class public class Circle { private static final double PI = 3.14; private double radius; public Circle() { radius = 1; } public void setRadius(double newRadius) { radius = newRadius; } }

  16. Jeroo Class • It is written in Java • Ask students what would it include? • 6 constructors • Member variables • Member methods

  17. Turtle Graphics • Downloaded from: • http://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20bI&product_isbn_issn=9780619267230 • Part of textbook resources for: • Fundamentals of Java by Lambert/Osbourne • Allows students to create simple graphics using Java

  18. Turtle Graphics • Good for showing: • Composition “has a” relationships • Inheritance “is a” relationships • Interfaces • Abstract classes

  19. Turtle Graphics • Create a Shape Interface • AbstractShape can implement Shape • Can implement members that would be the same for all shapes such as: • X and Y coordinates • Move function • Abstract methods would be: • Area • Draw

  20. Shape Hierarchy • Can implement Circle and Rectangle Classes with students. • Extend Abstract Shape • Assignment: • Students implement a Triangle Class • Students can add a Perimeter Method to the hierarchy

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