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

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for your Java exam with our ultimate quiz based on 'Thinking in Java'. Engage with expertly crafted questions that enhance your learning process. Perfect for Java enthusiasts looking to solidify their knowledge!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which Set implementation provides the fastest lookups?

TreeSet
HashSet
LinkedHashSet
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.