What is the difference between `Collectors.toUnmodifiableList()` and `Collections.unmodifiableList(Collectors.toList())`?

Explanation

`Collectors.toUnmodifiableList()` guarantees an unmodifiable list with no nulls in Java 10+, while `Collections.unmodifiableList(Collectors.toList())` wraps a mutable list that still allows null values. This difference is crucial for ensuring immutability and handling null values effectively.

Key points

`toUnmodifiableList()` ensures immutability and no nulls in Java 10+
`unmodifiableList(toList())` wraps a mutable list and allows null values
Understanding the distinction is important for proper list handling in Java

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