Java SE 8 came with a new engine called Nashorn, which is based on JSR 292. It provides compliance with the ECMA normalized JavaScript.
You can run JavaScript programs from the command line using Nashorn. Include a command-line tool called jjs. The bin folder of a JDK installation has it, with other tools like jar.
Here’s the js file new.js −
var display = function() { // print “Hello World!” here }; display();
Run it on a command prompt −
$ jjs new.js Hello World! $