What is the difference between `HashMap` and `Hashtable` in Java?

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Answered by suresh

Difference between HashMap and Hashtable in Java

The Difference between HashMap and Hashtable in Java

HashMap:

  • HashMap is not synchronized, which means it is not thread-safe.
  • HashMap permits null values and the null key.
  • HashMap allows one null key and multiple null values.
  • HashMap is faster than Hashtable for most operations.
  • HashMap is part of the Java Collections Framework.

Hashtable:

  • Hashtable is synchronized, making it thread-safe.
  • Hashtable does not allow null values or the null key.
  • Hashtable does not permit any null keys or values.
  • Hashtable is slower than HashMap for most operations due to synchronization.
  • Hashtable is a legacy class.

When choosing between HashMap and Hashtable in Java, consider the thread safety requirement and performance implications.

Answer for Question: What is the difference between `HashMap` and `Hashtable` in Java?