This is an electronics tutorial based on Paul Falstad's circuit simulator (original available at http://www.falstad.com/circuit/).
The preferred build process is using Apache Ant: use ant compile to build, then ant run to run the application.
If you don't have ant, but have make, run make jar to compile, and then make run to run the application.
If you have neither, compile with javac src/*.java, build the jar file with jar cfm buzzr.jar Manifest.txt *.class *.txt circuits/, and run the application with java -jar buzzr.jar.
The terms and conditions for the original code still apply. Check http://www.falstad.com/licensing.html before redistributing or modifying the code. You must always consult the original licensing information but, in case the link is unavailable, here is a copy of the original license (as of 2013-05-08):
You have permission to use these applets in a classroom setting or take
screenshots as long as the applets are unmodified. Modification or
redistribution for non-commercial purposes is allowed, as long as you
credit me (Paul Falstad) and provide a link to my page (the page you
found the applet(s) on, or http://www.falstad.com/mathphysics.html).
Contact me for any other uses. The source code for each applet is
generally available on that applet's web page, but some of the applets
use third-party source code that has restrictions.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Paul Falstad (original author), Rodrigo Hausen (added improvements).