PennSim PennSim Revised UI Mac PennSim Revised UI Windows PennSim Original UI Build Steps Compile single edited file using jar file as a dependency $ javac -classpath /path/to/PennSim.jar GUI.java Replace compiled file in jar $ jar uf /path/to/PennSim.jar GUI.class Open application $ java -jar /path/to/PennSim.jar