doc/nashorn/source/InvokeScriptMethod.java

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

@SuppressWarnings("javadoc")
public class InvokeScriptMethod {
    public static void main(final String[] args) throws Exception {
        final ScriptEngineManager manager = new ScriptEngineManager();
        final ScriptEngine engine = manager.getEngineByName("nashorn");

        // JavaScript code in a String. This code defines a script object 'obj'
        // with one method called 'hello'.
        final String script = "var obj = new Object(); obj.hello = function(name) { print('Hello, ' + name); }";
        // evaluate script
        engine.eval(script);

        // javax.script.Invocable is an optional interface.
        // Check whether your script engine implements or not!
        // Note that the JavaScript engine implements Invocable interface.
        final Invocable inv = (Invocable) engine;

        // get script object on which we want to call the method
        final Object obj = engine.get("obj");

        // invoke the method named "hello" on the script object "obj"
        inv.invokeMethod(obj, "hello", "Script Method !!" );
    }
}