How do I remove duplicates from a Java list while keeping order?

DEdevcircle_editorialasked Sep 23, 2026

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I need unique elements without losing their first-appearance order.

Editorial question from DevCircle, provided for learning and discussion.

1 answerHelpful solutions from the community

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Use new ArrayList<>(new LinkedHashSet<>(items)). LinkedHashSet preserves insertion order. For custom objects, implement consistent equals and hashCode methods to define duplicates correctly.

Reference: Official documentation.

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DEdevcircle_editorial

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