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Editorial Team
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Asked: 2026-05-16T14:45:55+00:00

I wish to Avoid duplicated item being inserted. When I iterate through the collection

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I wish to

  1. Avoid duplicated item being inserted.
  2. When I iterate through the collection class, the returned item is same as insertion order.

May I know, what thing I should consider, to choose either ArrayList (explicitly perform contains check before insertion) or LinkedHashSet?

Thanks.

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1 Answer

  1. Editorial Team

    Definitely use LinkedHashSet. It is made for what you need. Searching entire ArrayList every time you need to insert something will be performance killer (O(n) every time))

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