What is the difference between google's ImmutableList and Collections.unmodifiableList ()?

Question

From ImmutableList javadocs:

Unlike Collections.unmodifiableList(java.util.List), which is a view of a separate collection that can still change

Answer 1

1. No, the contained individual objects can still be modified. A collection is really only storing references to the contained objects, not a full copy of every object.
2. You can modify the list by modifying the parent Collection you called Collections.unmodifiableList(list) on. But yes, you CAN use setDimension to change a stored list element.