Is this set containing a certain element

  import java.util.HashSet;

public class Main{
    public static void main(String args[]) {
        HashSet<String> hs = new HashSet<String>();

        hs.add("java2s.com");
        hs.add("A");
        hs.add("D");
        hs.add("E");
        hs.add("C");
        hs.add("j a v a2s.com");

        System.out.println(hs.isEmpty());
    }
}