What is HashSet class?

HashSet extends AbstractSet and implements Set interface.
It uses hashing for storing values.
It does not guarantee the insertion order of elements.
It does not support duplicates.
Example:
import java.util.*;
class demo
{
public static void main(String[] args){
HashSet al=new HashSet();
al.add("bhabani");
al.add("pinku");
al.add("mahesh");
al.add("arvind");
al.add("arjan");
System.out.println(al);
}};
Output:
[Mahesh,pinku,arvind,bhabani,arjan]