import javax.script.Invocable;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

public class InterfaceTest {

  public static void main(String args[]) throws Exception{

    ScriptEngineManager manager = new ScriptEngineManager();

    ScriptEngine engine = manager.getEngineByName("javascript");

      engine.eval("function run() {print('www.java2s.com');}");

      Invocable invokeEngine = (Invocable) engine;

      Runnable runner = invokeEngine.getInterface(Runnable.class);

      Thread t = new Thread(runner);

      t.start();

      t.join();

  }

}