What is leJOS?
leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine. In 2013 it was ported to the LEGO EV3 brick.

leJOS for the EV3 includes all the classes in the EV3 API and a full Java run time system

leJOS EV3 offers the following:

  • Object oriented language (Java)
  • Preemptive threads (tasks)
  • Arrays, including multi-dimensional
  • Recursion
  • Synchronization
  • Exceptions
  • Java types including float, long, and String
  • Most of the java.lang, java.util and java.io classes
  • A Well-documented Robotics API

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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