LinkedHashSet maintains uniqueness and order but lacks efficient index-based lookups (O(n) time). Several approaches exist: direct iteration, converting to List/array (still O(n) for indexOf), maintaining separate List+Set structures, or building a custom implementation with dual maps for O(1) lookups. The custom approach with

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Table of contents
1. Overview2. LinkedHashSet3. Conversion4. List and Set5. Custom Implementation6. Complexity Overview7. Multithreading8. Conclusion

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