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Java HashSet clear() Method

Last Updated : 11 Jul, 2025

The clear() method of the HashSet class in Java is used to clear all the elements from the HahSet. This method makes the HashSet empty but does not delete the HashSet itself. It simply removes all elements, leaving the set ready for reuse.

Syntax of HashSet clear() Method

void clear()

Key Points:

  • After calling clear() the HashSet size becomes 0.
  • The clear() does not affect the internal capacity of the HashSet.

Example: This example demonstrates how the clear() method removes all the elements from the HashSet.


Output
HashSet before clear(): [1, 2, 3]
HashSet After clear(): []
HashSet isEmpty(): true
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