addresses.put(address, aam);
IPv4IfAddress ifAddress = new IPv4IfAddress(address, mask); addresses.put(address,ifAddress);  return ifAddress;
	public synchronized void add(IPv4Address address, IPv4Address subnetMask) {		final IPv4AddressAndMask aam = new IPv4AddressAndMask(address, subnetMask);		addresses.remove(address);		addresses.put(address, aam);	}