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

ImmutableList is similar to Collections.unmodifiableList( new ArrayList( list ) ) . Note that the newly created ArrayList is not assigned to a field or variable.