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What are the differences between HashMap and Hashtable in Java?

Damian99Damian99 USAPosts: 116Member

Can someone please explain the difference between a HashMap and a Hashtable in Java? Please also let me know which is more efficient for java applications which doesn't have multi-threading applied.

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Comments

  • DavidMDavidM USAPosts: 342Member

    HashMap is not synchronized.

    1. Good for non-threaded applications.
    2. Performance is better.
    3. Allows one null key and any number of null values

    Hashtable is synchronized.

    1. Good for threaded applications.
    2. Null keys or values are not allowed
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