LeJOS technology

What is leJOS?
leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine for the Lego Mindstorms RCX.

leJOS was originally forked out of the TinyVM project.
It contains a VM for Java bytecodes and additional software to load and run Java programs.

These are some of the features offered:

  • Object oriented language (Java)
  • Preemptive threads (tasks)
  • Arrays, including multi-dimensional ones
  • Recursion
  • Synchronization
  • Exceptions
  • Java types including float, long, String, but with some restrictions
  • Math class
  • Well-documented Robotics API

Documentation and Tutorials


Disclaimer: Java is a trademark of Sun Microsystems. Lego Mindstorms is a trademark of the LEGO Group. There is no association between Lego and leJOS or Sun and leJOS, or even between Lego and Sun as far as we know.

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