[Java] - The Nashorn Engine

Oracle Nashorn Engine is used interpreter JavaScript language. The scenario for Oracle Nashorn Engine as a command-line tool and embedded interpreter in Java Applications.
Note: Oracle Nashorn Engine be able to SE 9.

I. It's just javascript.
Example 1:

------------helloWorld.js------------
//start
var hello = function() {
      print("Hello Oracle Nashorn Engine");
};
helloworld();
//end
------------helloWorld.js------------

Evaluating it as simple as this:
$jjs helloWorld.js
Hello Oracle Nashorn Engine

Example 2:
------------helloWorld.js------------
//start
var sum = function (a, b) {
    return a + b;
};
print("Sum = " +  sum(3,4));
//end
------------helloWorld.js------------

Evaluating it as simple as this:
$jjs helloWorld.js
Sum = 7

II. Embedding Oracle Nashorn
Oracle Nashorn from a Java application to define javascript statements, call it as we write code in a javascript file. It helps when we want to load a javascript code to Oracle Nashorn and work on that.

Example:
package learning.javacore.oraclenashsorn.samples;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class Sample1 {

private static final String NASHORN_ENGINE = "nashorn";

public static void main(String[] args) {

//declared ScriptEngineManager and ScriptEngine
ScriptEngineManager engineMrg = new ScriptEngineManager();
ScriptEngine engine = engineMrg.getEngineByName(NASHORN_ENGINE);

//declared a js codes.
String js = "var sum = function(a,b) { return a + b;};";

try {
engine.eval(js);
System.out.println(engine.eval("sum(3,4);"));
} catch (ScriptException e) {
}
}
}

We can do more with Oracle Nashorn. Please see details: http://www.oracle.com/technetwork/articles/java/jf14-nashorn-2126515.html