java dynamically determine currently executing class

I'm trying to write a Serializable lambda which can call a method within the object instance which runs it.

I'm going to be passing this lambda to the object instance which is will run it, immediately after instantiating it, but because I want to serialize these objects containing the lambdas, I need a way of dynamically determining a reference to the object instance.

here is what I'd like to do if the currentClass() method existed.

Runnable r = (Runnable & Serializable)() -> {
  try { 
    // currentClass() doesn't exist
    Class curClass = Thread.currentThread().currentClass();
    Method setCol = curClass.getMethod("setColor", Class.forName("Color"));
    setCol.invoke(curClass, Color.BLACK);

  } catch (NoSuchMethodException e | ClassNotFoundException e
      | IllegalAccessException e | IllegalArgumentException e 
      | InvocationTargetException e) {
    e.printStackTrace();
  } 
}

MySquare sq = new MySquare();
sq.setRunnable(r);

sq.runRunnable(); // calls r.run()

To clarify, I'd like to serialize sq. Then when I read recreate sq from the .ser file, I'd like to be able to execute sq.runRunnable()