The next demo is the introduction to interfaces lesson from the text book A Gentle Introduction to Object Oriented Programming with Karel J Robot where each contractor implements a Worker interface to build a part of the house.
#Greenfoot intersects simulator#
Karel J Robot is another good simulator that can used for labs (also available to educators via GreenRoom), as can any tile-based game or application. Greenfootis an integrated development environmentusing Javaor Stride designed primarily for educationalpurposes at the high schooland undergraduatelevel. A cell can really only live or die is represented by an Actor subclass but should never be able to behave as one, ie move or rotate. The logic behind the simulation is very easy to understand and implement, and this allows the student to focus on design issues that interfaces help with. I use Conway's Game Of Life as a project for a few labs. Putting a visual representation of an object onto the world is referred to as creating an instance of an object. Programmers define the Actor objects and then drags an instance of them onto a world to create a scenario. You will see these issues clearly if you create any scaffolded exercises or simulations of your own. Greenfoot uses two-dimensional (2D) Actor objects.
In many applications programmers are making use of the World/Actor mechanism (by subclassing), yet these classes often have their own unique behavior and semantics that are separate and distinct from the Actor class and are only Actors to leverage the Greenfoot World/Actor architecture. The goal is to target students in the pre-teen years and older by providing a development environment which is both engaging and flexible. In a Greenfoot application most visible objects are Actors. Greenfoot is a joint project funded by Sun Microsystems and implemented at the University of Kent at Canterbury (UK) and Deakin University, Melbourne (Australia). Using interfaces add clarity to the design and responsibility of classes in an application.
#Greenfoot intersects code#
This is very useful and worth demonstrating via code completion (ctrl+.) and compiler errors. On the other hand, when working programmatically the coder will be restricted to the methods defined by the declared type ( the interface). You could write code in your game so that a predator object is able to eat prey objects, or when objects intersect they bounce off or stick to each other. Even if the declared type is an interface. This can be confusing as students will be able to execute (via the context menu) all methods that are in its hierarchy: Object, Actor, ASubClass, etc. Using and demonstrating interfaces will take some work though.Īnything that gets added to the world will be displayed and interacted with as it's actual type via the context menu. One huge advantage to using Greenfoot is the visualization and interactive nature of the application.
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