Difference between HashSet and HashMap | HashSet vs HashMap | Interview QA

Published: 15 February 2024
on channel: Java Guides

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Difference Between HashSet and HashMap | HashSet vs HashMap

HashSet stores only unique elements and is used when you don’t need key-value pairs. It internally uses a HashMap to maintain uniqueness.
HashMap stores key-value pairs and allows one null key and multiple null values. It is used when you need to map keys to values.
Use Case: Use HashSet for collections of unique elements and HashMap when mapping between keys and values is required.

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