Easy Java Simulations, also known as EJS or Ejs, is a free authoring tool written in Java that helps non-programmers create interactive simulations in Java, mainly for teaching or learning purposes.

A software tool (java code generator) designed for the creation of discrete computer simulations.

A discrete computer simulation, or simply a computer simulation, is a computer program that tries to reproduce, for pedagogical or scientific purposes, a natural phenomenon through the visualization of the different states that it can have. Each of these states is described by a set of variables that change in time due to the iteration of a given algorithm.

All this means that EJS is a program that helps you create other programs; more precisely, to create scientific simulations

Running EJS on Windows or Mac OS
Simply double-click on the file EjsConsole.jar. Tips: Add a shortcut to your desktop. Windows explorer will often hide the extension ".jar".

Ejs Console has three tabs: Basic options, Advanced options, and Output area. You can minimize the console window, but it cannot be closed while EJS is running. However, if you check "Minimize the console" under Basic options, it will start minimized the next time that you launch EJS. But beware: Some error messages may appear in the Output area of the console. So check that tab, too, in the case that your own simulation would not launch as expected.

The license of this software is Free, you can free download and free use this application software.