KITFORMA · EDITORIAL ANSWER
Why does keeping a subList produce surprising changes after editing its parent?
KitForma editorial guide. A slice can be a view of another container instead of an independent snapshot. Decide whether your consumer should observe future parent edits.
Step-by-step answer
A slice can be a view of another container instead of an independent snapshot. Decide whether your consumer should observe future parent edits.
For an export job that must retain the selected rows, use
new ArrayList<>(source.subList(from, to)) while the source is in a stable state. Validate the half-open range: from is included and to is excluded. If a backed view is intentional, keep ownership and permitted structural operations tightly controlled.
Test modification of an element and structural insertion/removal in the parent separately. A copied list protects its own structure but still shares referenced row objects. For a truly frozen export, copy the row data as well or use immutable row values; do not promise a deep snapshot merely because the list was copied.Sources and verification
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