Java HashSet clear() Method
Last Updated :
11 Jul, 2025
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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.
// Java program to demonstrates the working of clear()
import java.util.*;
public class Geeks {
public static void main(String[] args)
{
// Create a HashSet
HashSet<Integer> hs = new HashSet<Integer>();
// Add elements to HashSet
hs.add(1);
hs.add(2);
hs.add(3);
System.out.println("HashSet before clear(): " + hs);
// Clear the HashSet
hs.clear();
System.out.println("HashSet After clear(): " + hs);
System.out.println("HashSet isEmpty(): "
+ hs.isEmpty());
}
}
Output
HashSet before clear(): [1, 2, 3] HashSet After clear(): [] HashSet isEmpty(): true
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