Java IPAdress über Tastatur einlesen

[slightly_beeraged]

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import sun.net.util.IPAddressUtil;

...

String ipadr;
try {
   BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
   do {
      System.out.print("IP-Addresse: ");
      ipadr = reader.readLine();
   } while (!IPAddressUtil.isIPv4LiteralAddress(ipadr));
} catch (IOException e) {
   e.printStackTrace();
   return;
}