Forwarding of objects in Android (Java)?Reference...?

Um...

I'm studying Android right now and I'm asking you a question because I'm confused

Situation? To explain

Class mainActivity extends Activity {
    A a = new A(this); 
}

Class A{

    Activity activity;
    B b;

    public A( Activity activity){
        this.activity = activity;
    }

    b = new B(activity);

}

Class B{

    Activity activity;


    public B( Activity activity){
        this.activity = activity;
    }

In this state, does the activity variable of object a and object b refer to the same object?

Um... I know that an object of a class other than the normal type (int, float, char, etc.) has an address value and that address value is the address of the object, but since it passed itself from mainActivity to this, is mainActivity, a, b the same?

If it is the same, does the capacity occupy only one main activity capacity instead of the size * 3 of the main activity class?

I don't know how to explain it. It's very complicated <

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I don't know if it's right or left here.