As I aware that both Collection methods provides read-only access to returned list and throws Exception on modification.
I need to understand Use Cases of both so that when to use singletonList and unmodifiableList.
This might help me to grow understanding of both based on their usage.
singletonList takes an item, and creates an immutable list containing only that item. unmodifiableList takes a list, and creates an immutable list that references that list. It is analogous to the difference between add and addAll. One takes an item, one takes a list containing items.
So if you have a List<...> list, singletonList (list).get(0) returns list but unmodifiableList (list).get(0) returns list.get(0). And the former is rarely useful.
