Java - getting MAC address test program - issue Slowpoke101/FTBLaunch#758

gistfile1.java

import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class TestNetworkInterfaces {
    public static void main(String[] args) {
        boolean returned = false;
        try {
            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
            while (networkInterfaces.hasMoreElements()) {
                NetworkInterface network = networkInterfaces.nextElement();
                byte[] mac = network.getHardwareAddress();
                boolean ok = false;;
                if (mac != null && mac.length > 0 && !network.isLoopback() && !network.isVirtual() && !network.isPointToPoint()) {
                    ok = true;
                    returned = true;
                }
                String macStr = "(null)";
                if(mac != null && mac.length > 0) {
                    StringBuilder sb = new StringBuilder();
                    for (int i = 0; i < mac.length; i++) {
                        sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? ":" : ""));        
                    }
                    macStr = sb.toString();
                }
                System.out.println(network.getDisplayName() + " - " + macStr + " - " + network.isLoopback() + " - " + network.isVirtual() + " - " + network.isPointToPoint() + " - " + (ok ? "returned this address" : "doesn't match criteria"));
            }
        } catch (SocketException e) {
            System.out.println("Exception getting MAC address");
            System.out.println(e);
        }

        if(!returned) {
            System.out.println("Failed to get MAC address, using defalt logindata key");
        }
    }
}