Get Size of Java HashSet

   package org.best.example;
    /*
      Get Size of Java HashSet Example
      This Java Example shows how to get the size or nubmer of elements stored in
      Java HashSet object using size method.
    */
    
    import java.util.HashSet;
    
    public class GetSizeOfJavaHashSetExample{
    
      public static void main(String[] args) {
      
        //create HashSet object
        HashSet hSet = new HashSet();
      
        /*
          To get the size of HashSet use
          int size() method of HashSet class. It returns the number of elements
          stored in HashSet object.   
        */
        System.out.println("Size of HashSet : " + hSet.size());
      
        //add elements to HashSet object
        hSet.add(new Integer("1"));
        hSet.add(new Integer("2"));
        hSet.add(new Integer("3"));
    
        System.out.println("Size of HashSet after addition : " + hSet.size());
      
        //remove one element from HashSet using remove method
        hSet.remove(new Integer("1"));
        System.out.println("Size of HashSet after removal : " + hSet.size());
      }
    }
    
    /*
    Output would be
    Size of HashSet : 0
    Size of HashSet after addition : 3
    Size of HashSet after removal : 2
    */