Java - obtener dirección mac en java

String firstInterface = null;

Map<String, String> addressByNetwork = new HashMap<>();

Enumeration<NetworkInterface> networkInterfaces;

try

{

	networkInterfaces = NetworkInterface.getNetworkInterfaces();

	while(networkInterfaces.hasMoreElements())

	{

NetworkInterface network = networkInterfaces.nextElement();

byte[] bmac = network.getHardwareAddress();

if(bmac != null)

{

	StringBuilder sb = new StringBuilder();

	for (int i = 0; i < bmac.length; i++)

	{

		sb.append(String.format("%02X%s", bmac[i], (i < bmac.length - 1) ? "-" : ""));

	}

	if(sb.toString().isEmpty()==false)

	{

		addressByNetwork.put(network.getName(), sb.toString());

	}

	if(sb.toString().isEmpty()==false && firstInterface == null)

	{

		firstInterface = network.getName();

	}

}

	}

} catch (SocketException e)

{

	system.out.println(e.getMessage());

}

if(firstInterface != null)

{

	MACAddress= addressByNetwork.get(firstInterface);

}