Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

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Which Set implementation provides the fastest lookups?

  1. TreeSet

  2. HashSet

  3. LinkedHashSet

  4. EnumSet

The correct answer is: 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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