The Turtle- and World-classes lets the student begin to learn Java-programming by experimenting with objects, methods, parameters, variables in a visual setting as they move the turtles around in the world. This implementation is new as of March 2015 but the idea is a classic in computer science education.
The reason for producing this piece of code is to make a self-contained pair of files which are easy for the students to download, run and make simple modifications to. (Without having to mess around with classpath and other uninspiring concepts at the beginning of the journey which is a delicate time.)
If you don't want to download the whole repository, just grab src/World.java and src/Turtle.java. They are all you need really if you don't want javadoc documentation and other misc things.
I would be grateful for bug reports or suggestions for improving code functionality, naming and structuring of the classes, methods and attributes, readability and documentation.
All the material in this repository is licensed under the ISC-license which basically lets you do whatever you want with it as long as you don't blame me for anything. :)