In the 1960s, an educational programming language called Logo was developed. It is best known for teaching programming with turtles! The turtles were graphical or robotic turtles that were controlled with simple commands like go forward or turn right. Here’s a photo of a robot turtle from the 1960s.

The turtle had a pen attached to it. The student-programmers would steer the robot around using simple commands to create drawings with their code.

This was later used (in a simulated state) to teach newer programming languages as they get invented. Here we have the Java incarnation of Turtle Graphics.

Read more about it here or here

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Package ch.aplu.turtle Description

The Java Turtle Package provides functionality for LOGO-like Java-Programs (including multiple turtles). It is written for educational purposes by Regula Hoefer-Isenegger for the AHL at the University of Berne under the supervision of Prof. Dr. Aegidius Plüss. The Java Turtle Package comes under the GNU GENERAL PUBLIC LICENSE, Version 2, June 1991 (which you can find in the COPYING file which comes along with this package) and is copyrighted by the author.

Here's a simple sample program which shows how to use the Java Turtle Package:

jturtle.jar Library of classes to draw with a turtle. You can get the latest version here