Java APIs for Nashorn - Scripting in Java: Integrating with Groovy and JavaScript - page 328

ScriptEngine engine = manager.getEngineByName("JavaScript");
try {
// Execute the script in the file
engine.eval("load('" + scriptFileName + "');");
// Get the Point constructor as a ScriptObjectMirror
// object
ScriptObjectMirror pointFunc = (ScriptObjectMirror)
engine.get("Point");
// Create two Point objects. The following statements
// are the same as var p1 = new Point(10, 20);
// and var p2 = new Point(13, 24); in a Nashorn script
ScriptObjectMirror p1 = (ScriptObjectMirror)
pointFunc.newObject(10, 20);
ScriptObjectMirror p2 = (ScriptObjectMirror)
pointFunc.newObject(13, 24);
// Compute the distance between p1 and p2 calling
// the distance() method of the Point object
Object result = p1.callMember("distance", p2);
double dist = ((Number)result).doubleValue();
// Get the string forms of p1 and p2 by calling
// their toString() method
String p1Str = (String)p1.callMember("toString");
String p2Str = (String)p2.callMember("toString");
System.out.printf("The distance between %s and %s is
%.2f.%n",
p1Str, p2Str, dist);
}
catch (Exception e) {
e.printStackTrace();
}
}
}
The distance between Point(10, 20) and Point(13, 24) is 5.00.