What is the fastest way to get the domain/host name from a URL?

Question

I need to go through a large list of string url\'s and extract the domain name from them.

For example:

http://www.stackoverflow.com/questions

Answer 1

There is only an another way to get the host

private String getHostName(String hostname) {
    // to provide faultproof result, check if not null then return only hostname, without www.
    if (hostname != null) {
        return hostname.startsWith("www.") ? hostname.substring(4) : getHostNameDFExt(hostname);
    }
    return hostname;
}

private String getHostNameDFExt(String hostname) {

    int substringIndex = 0;
    for (char character : hostname.toCharArray()) {
        substringIndex++;
        if (character == '.') {
            break;
        }
    }

    return hostname.substring(substringIndex);

}

Now we've to pass the hostname in function after extract from URL

URL url = new URL("https://www.facebook.com/");
String hostname = getHostName(ur.getHost());

Toast.makeText(this, hostname, Toast.LENGTH_SHORT).show();

The output would be: "facebook.com"