URL.equals

import java.net.MalformedURLException;
import java.net.URL;

class Playground {
    final static String urls[][] = {
        {"facebook.com", "m.facebook.com"},
        {"www.google.com", "www.l.google.com"},
        {"www.ilfattoquotidiano.it", "www.ilfattoquotidiano.it.cdn.cloudflare.net."},
        };
    public static void main(String[ ] args) throws MalformedURLException {
        for (String url[] : urls)
            System.out.println(url[0] + " == " + url[1] + ": " +
                new URL("https://" + url[0]).equals(new URL("https://" + url[1]))
);
    }
}