Netsim: Java-based simulation for the World Wide Web. Current literature motivates development of a general, WWW-based simulation package with maximum user interactivity and cross-platform capabilities. Netsim, a general, WWW-based, discrete-event simulation package written entirely in Java, meets this need. Java is an object-oriented programming language designed for internet programming. It makes Netsim possible and enables easy incorporation with existing WWW materials. As a result, Netsim supports and enhances the existing WWW environment for users of all levels. Netsim provides complete model creation and modification capabilities, through the event graph paradigm, along with both graphical animation and data output. Netsim allows expandability for complex modeling and integration with other Java-based programs and future extensions.