'Alternative for Collections.unmodifiableSet

So, I have a class containing a Set and I want to return a read only version of it.

One way would be to use Collections.unmodifiableSet(set).

But this creates a new instance of UnmodifiableSet internally which I think is a cost concern

What alternative do we have in java

PS: I have looked for similar question on stackoverflow, could not find one.

java collections

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