This program prints out the name and the address (in both textual and numerical forms) of the machine on which its run, using the InetAddress singleton.

import java.net.*;public class CurrentHost {  public static void main(String[] args) throws UnknownHostException {    InetAddress address = InetAddress.getLocalHost();    System.out.println("This host's name: " + address.getHostName());    System.out.println("This host's fully qualified address: " +      address.getCanonicalHostName());    System.out.println("This host's numerical address: " +      address.getHostAddress());  }}