what is the sense of final ArrayList?

Question

Which advantages/disadvantages we can get by making ArrayList (or other Collection) final? I still can add to ArrayList new elements, remove elements and update it. But what

Answer 1

final has a lot of consequences under multi threading.

1. JMM clearly defines a final field's initialization completion is guaranteed.

What's not clearly defined is:

1. Compilers are free to reorder them across memory barriers.
2. Compilers can always read a cached copy.