As submitted by a user:
Installation of TurtleGraphics and TerminalIO for a new world Macintosh (G3 or G4) running OS X (in my case 10.2.4) involves finding the folder /Library/Java/Extensions and placing the .jar files in that folder. No restart is needed. Correctly made .java programs compile using javac with the use of TurtleGraphics and TerminalIO and the resultant runs correctly using java. No use of CodeWarrior was needed. Just the .jar files were used. It works in the command line under the Terminal application as well as using X11's terminal.