Remove all elements from Java HashSet

   package org.best.example;
   /*
      Remove all elements from Java HashSet example
      This Java Example shows how to remove all elements contained in Java HashSet
      or clear HashSet object using clear or removeAll methods. It also shows how
      to check whether HashSet object is empty or not using isEmpty method.
    */
    
    import java.util.HashSet;
    
    public class RemoveAllElementsFromHashSetExample {
    
      public static void main(String[] args) {
    
        //create object of HashSet
        HashSet hSet = new HashSet();
      
        //add elements to HashSet object
        hSet.add(new Integer("1"));
        hSet.add(new Integer("2"));
        hSet.add(new Integer("3"));
      
        System.out.println("HashSet before removal : " + hSet);
      
        /*
          To remove all elements from Java HashSet or to clear HashSet object use,
          void clear() method.
          This method removes all elements from HashSet.
        */
      
        hSet.clear();
        System.out.println("HashSet after removal : " + hSet);
      
        /*
          To check whether HashSet contains any elements or not use
          boolean isEmpty() method.
          This method returns true if the HashSet does not contains any elements
          otherwise false.
        */
      
        System.out.println("Is HashSet empty ? " + hSet.isEmpty());   
      
        /*
          Please note that removeAll method of Java HashSet class can also be
          used to remove all elements from HashSet object.
        */
      }
    }
    
    /*
    Output would be
    HashSet before removal : [3, 2, 1]
    HashSet after removal : []
    Is HashSet empty ? true
    */