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What are the major differences between a HashSet and a HashMap?

Pragya Keshap answered on February 4, 2023 Popularity 8/10 Helpfulness 2/10

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  • What are the major differences between a HashSet and a HashMap?

    0

    The main difference between a HashSet and a HashMap are:

    1. Base class: A HashSet class implements the Set interface.

    Whereas a HashMap class implements the Map interface.

    2. Storage: A HashSet is used to store distinct objects. A

    HashMap is used for storing key & value pairs, so that

    these can be retrieved by key later on.

    3. Duplicate Elements: A HashSet does not allow storing

    duplicate elements. A HashMap also does not allow

    duplicate keys. But we can store duplicate values in a

    HashMap.

    4. Null Elements: In a HashSet we can store a single null

    value. In a HashMap we can store single null key, but any

    number of null values.

    5. Element Type: A HashSet contains only values of objects

    as its elements. Whereas a HashMap contains entries(key

    value pairs).

    6. Iteration: By using an Iterator we can iterate a HashSet.

    But a HashMap has to be converted into Set for iteration.

    https://www.geeksforgeeks.org/difference-between-hashmap-and-hashset/

    Popularity 8/10 Helpfulness 2/10 Language java
    Source: Grepper
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    Contributed on Feb 04 2023
    Pragya Keshap
    0 Answers  Avg Quality 2/10


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