KITFORMA · EDITORIAL GUIDE
Why can Arrays.asList change an element but cannot append a new one?
KitForma editorial guide. The returned list is a view with a fixed size. Element replacement and structural growth are different permissions.
Step-by-step guidance
The returned list is a view with a fixed size. Element replacement and structural growth are different permissions.
When the application needs an editable list, construct
new ArrayList<>(Arrays.asList("red", "blue")). If a shared array view is intentional, document that replacement can affect the backing array and avoid structural operations. Do not catch UnsupportedOperationException as the normal append strategy; choose the container contract at construction.
Verify add, remove and set independently, and check whether the original array changes after replacement. A new ArrayList detaches the container shape but does not deep-copy referenced objects. Also avoid assuming Arrays.asList of a primitive array creates a list of boxed elements; that is a separate generic inference case.Sources and verification
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