Mastering Java: The Ultimate Quiz for 'Thinking in Java' 2025 - Free Java Programming Practice Questions and Study Guide

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Question: 1 / 510

Which Set implementation provides the fastest lookups?

TreeSet

HashSet

A HashSet provides the fastest lookups because it uses a hashing function to map values to indices, allowing for efficient retrieval and storage without any particular ordering. TreeSet and LinkedHashSet both use a binary tree data structure which requires more time for lookups due to comparisons and sorting. EnumSet is optimized for enums, but does not offer particularly fast lookups for all types of data.

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LinkedHashSet

EnumSet

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