code for Javascript script in a file

import java.io.FileReader;

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

public class RunScriptFileDemo {
public static void main(String[] args) {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
try {
FileReader reader = new FileReader("yourFile.js");
engine.eval(reader);
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
/* File: yourFile.js
*
function add(a, b) {
c = a + b;
return c;
}

result = add (10, 5);
print ('Result = ' + result);
*/