import java.net.*;
public class IPtoName{
public static void main(String args[]){
if (args.length == 0){
System.out.println("Pemakaian : java IPtoName
System.exit(0);
}
String host = args[0] ;
InetAddress address = null ;
try{
address = InetAddress.getByName(host);
}catch(UnknownHostException e){
System.out.println("invalid IP");
System.exit(0);
}
System.out.println(address.getHostName());
}
}
Jalankan dengan argumen IP komputer lokal dan komputer lain.
$ javac IPtoName.java
$ java IPtoName
$ java IPtoName
$ java IPtoName
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