The Java.util.HashSet.clear() method is used to remove all the elements from a HashSet. Using the clear() method only clears all the element from the set and not deletes the set. In other words, we can say that the clear() method is used to only empty an existing HashSet.
Parameters: The method does not take any parameter
Return Value: The function does not returns any value.
Below program illustrate the Java.util.HashSet.clear() method:
HashSet: [4, Geeks, Welcome, To] The final set: 
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.