java - List foreach method

I made this method:

public void update(){
        for(GameObject object : objects)
            object.update();
}

And then my IDE I could use for each instead any, that I what thought I did, any I let it replace it. This it what it gave me:

public void update(){

        objects.forEach(GameObject::update);
}

At first glance, this seems to better, and then my IDE was saying you can convert this to lambda expressions which would be:

public void update(IUpdater updater){
        objects.forEach((object) -> object.update());
}

Which gave the impression that GameObject:: update is some time of lambda expressions, bare in mind the only new stuff to java 8 that I know of (object) -> object.update() replaces anonymous class guess it still under the hood somewhere.

Does this essence 'objects.forEach(GameObject::update)' means:

public void update(){
    objects.forEach(new Consumer() {
        @Override
        public void accept(GameObject object) {
            object.update();

        }
    });
}

And if that is the case then would my original method be more efficient that GameObject::update. Have left it the method as GameObject::update but will change it back if find original method be more efficient.

I am asking the question on a purely on the basis of performance.