18_hashset.txt

Set:

set interface does not accept duplciate values;

Hashset treeset, linkedhashset implements set interface


there is no guarantee that elements are stored in sequencial order. random order

 hs.add("India");
        System.out.println(hs);
        hs.remove("India");
        hs.isEmpty();
        hs.size();
    }
	
Iterator interface:
HashSet<String> hs = new HashSet<String>();
Iterator<String> i = hs.next();

while(i.hasNext())
{
}