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class Helper {
  public List<InetAddress> ips = Collections.synchronizedList(new ArrayList<InetAddress>());
  
  public synchronized void addIPAddress(InetAddress ia) {
    // Validate
    ips.add(ia);
  }

  public synchronized void doSomething() throws UnknownHostException {   
    InetAddress[] ia;   
   addIPAddress(InetAddress.getLocalHost());
    InetAddress[] ia = (InetAddress[]) ips.toArray(new InetAddress[0]);     
    System.out.println("Number of IPs: " + ia.length); 
  }
}