Delete all the elements from HashSet

Here we are gonna see how to remove all the elements of HashSet in one go. We can do so by calling clear() method of HashSet class.

Example

import java.util.HashSet;
class EmptyHashSetExample{ 
  public static void main(String[] args) {
     // Create a HashSet
     HashSet<String> hset = new HashSet<String>();
 
     //add elements to HashSet
     hset.add("Element1");
     hset.add("Element2");
     hset.add("Element3");
     hset.add("Element4");
     hset.add("Element5");
 
     // Display HashSet elements
     System.out.println("Before: HashSet contains: "+ hset);
 
     /* public void clear(): It removes all the elements
      * from HashSet. The set becomes empty after this
      * method gets called.
      */
     hset.clear();
 
     // Display HashSet content again
     System.out.println("After: HashSet contains: "+ hset);
  }
}

Output:

Before: HashSet contains: [Element1, Element2, Element3, Element4, Element5]
After: HashSet contains: []