- VERSION 1.2 (beta release - August 1997) -
What is simjava?
simjava is a process based discrete event simulation package
for Java, similar to Jade's Sim++, with
animation facilities. If that means nothing to you, then take a look at
the examples to see what's possible.
The basic idea is a collection of entities each of which runs in its own
thread. These entities are connected together by ports and
can communicate with each other by sending and receiving
event objects. A central system class controls all the threads, advances
the simulation time, and delivers the events. The progress
of the simulation is recorded through trace messages produced by the
entities, and saved in a file.
A simulation layout
What's new in version 1.2?
- Added "simdiag" package for timing diagrams. This
is a collection of javabeans for displaying results.
- Included option to bundle class and bitmap files into a "jar"
Java archive, to cut down on startup time across
- Changed animation mechanism. In version 1.1 the entire
simulation ran to completion, then the trace file was read
in and animated. In version 1.2 the simulation is run in
lockstep with the animation. This allows the simulation
model to be altered on the fly.
Some examples of the applet animation features of simjava in
(NB These all use release 1.1 of Java, and will not work
under browsers which only support Java version 1.0.2. HotJava1.0
currently supports JDK1.1, and the next releases of Explorer
and Netscape claim to, but these applets have only been tested
using Sun's JDK1.1.3 and HotJava1.0 on Solaris. Additionnally,
it appears that some older version of Netscape may fail to load images correctly
where Mozilla browser do not.)
See the simjava home page for download details.
There are three tutorial guides and a design document:
And three reference documents generated using javadoc:
index.html -- This file
classes/ -- The .class files
eduni/ -- The source code
doc/ -- Documentation
ref/ -- javadoc generated detailed docs
simjava_guide/ -- User guides
jars/ -- jar archives
examples/ -- Examples, see README.txt for details
If you have any comments on the package, or bugs to report, then please
send them to the address below. We would also like to hear from you if
you've written a new animation applet and have it on the web.
Fred Howell -
Department of Computer Science
University of Edinburgh