Collection.unmodifiableMap iteration order

Question

Does Colelction.unmodifiableMap safeguard the iteration order?

I was trying newMap.put(key,Collections.ModifiableMap(oldMap)) Then when I do newMap.get(key) and iterate, iterate order seems to change.

How can we protect the iterate order?

Answer 1

UnmodifiableMap simply delegates all methods, except writing ones. It's order is exactly that of the delegate.

If you need to have the same order as the first collection, use LinkedHashMap.