Java has recently emerged as a powerful programming language for developing platform-independent, interactive and computational based software that can be used on the WorldWide Web through a Java-enabled Web browser. The paper introduces the Java programming language, its advantages and disadvantages, and its characteristics for developing interactive instructional applications on the WorldWide Web. The interactive and computational capabilities of Java are demonstrated through a simple matrix assembly applet (a piece of networked software). This applet allows the student to assemble element equations into the global (assemblage) equations for the finite element method (FEM). The matrix assembly applet features a graphical user-friendly interface, on-line help and interactive feedback. The authors are currently using Java to develop a prototype interactive learning tool for the onedimensional bar element. The interactive learning tool for finite element method is called FEMur-CAL (Finite Element Method universal resource Computer-Assisted Learning). This FEM tool does not replace the conventional classroom experiences, but provides supplementary instruction to students who need extra help. The prototype will be integrated into the 'Learn the Finite Element Method' component of the Finite Element Method universal resource (FEMur).