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Array vs List mutation in JAVA 🔥 must-know difference for interviews
Автор: Programming With Vishnu
Загружено: 2025-06-04
Просмотров: 973
Описание:
✅ Why list reflects changes in arr (e.g., arr[0] = "Z")
Arrays.asList(arr) returns a fixed-size list backed by the original array.
That means both arr and list point to the same underlying data.
So, when arr[0] = "Z" is done, list.get(0) also shows "Z".
❌ Why list.add("C") throws UnsupportedOperationException
The list from Arrays.asList() is not a real ArrayList, but a special internal class.
It doesn't support structural changes like add(), remove() — because the size of the underlying array cannot change.
So when you try to add, it throws java.lang.UnsupportedOperationException at runtime.
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