Mastering Java: The Ultimate 2025 All-In-One Quiz to Excel in 'Thinking in Java

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What data structure is used to represent the key information in hashing?

Linked list

Binary search tree

Array

An array is used to represent key information in hashing because it is able to generate a unique index for each key, allowing for constant time lookup and insertion of key-value pairs. The other options, such as linked lists, binary search trees, and stacks, do not have the same efficient lookup and insertion times and do not provide a unique index for each key. Linked lists have linear time lookup, binary search trees have log time lookup, and stacks do not provide a key-value pair structure. Therefore, an array is the most suitable data structure for efficiently representing key information in hashing.

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