Question

The mac address string may be in format:

00:aa:bb:cc:dd:ee

or

00aabbccddee

I need a good way to retrieve the 6 parts.

Here my code:

public class Mac
{
    public static void main(String[] args)
    {
        String mac = "00:aa:bb:cc:dd:ee"; /* 00aabbccddee */
        Scanner s = new Scanner(mac);
        s.useDelimiter(":?"); /* zero or one occurrence */                                                                                                                             
        String t = null;
        while ((t = s.next("[0-9a-f][0-9a-f]")) != null)
            System.out.println(t);
    }
}

It throws a exception:

Exception in thread "main" java.util.InputMismatchException
        at java.util.Scanner.throwFor(Scanner.java:840)
        at java.util.Scanner.next(Scanner.java:1461)
        at java.util.Scanner.next(Scanner.java:1394)
        at Mac.main(Mac.java:11)

What’s wrong with it?

Answer 1

public static String[] getMacAddressParts(String macAddress) {
    String[] parts = macAddress.split(":");
    if (parts.length == 0) {
        parts = new String[6];
        for (int i = 0; i < 6; i++) {
            parts[i] = macAddress.substring(i * 2, i * 2 + 1);
        }
    }
    return parts;
}