public class uu {
    public static void main(String[] args)  {
        String domain = "www.xyzw.com";
        String[] strArray = domain.split("\.");
        for (String str : strArray) {
            System.out.println(str);
        }
    }
}

String s = domain.substring(domain.lastIndexOf(".")+1);

String domain = "www.xyzw.com";
 String[] strArray = domain.split("\.");
  System.out.println(strArray[2]);

String r = strArray[strArray.length - 1];

String r = domain.substring(domain.lastIndexOf(".") + 1);

InternetDomainName.from("www.xyzw.com").publicSuffix();