Question

Trying to make a loop of MAC address values with:

String macAddr = "AA:BB:CC:DD:";
char[] chars = {'A', 'B', 'C', 'D', 'E', 'F'};
String[] strings = {"0", "0", "0", "0"};

for (int i=0; i<strings.length; i++)
{
    //counter from 0 to F
    for (int d = 0; d <= 9; d++)
    {
        strings[i] = ""+d;
        print();
    }
    for (int d = 0; d< chars.length; d++)
    {
        strings[i] = ""+chars[d];
        print();
    }
}

where print() is:

System.out.println(macAddr+strings[3]+strings[2]+":"+strings[1]+strings[0]);

But i’m getting run-over:

AA:BB:CC:DD:00:0D
AA:BB:CC:DD:00:0E
AA:BB:CC:DD:00:0F
AA:BB:CC:DD:00:0F
AA:BB:CC:DD:00:1F
AA:BB:CC:DD:00:2F
AA:BB:CC:DD:00:3F

The two problems are the dual values at each crossover (e.g. AA:BB:CC:DD:00:0F)
and the values stopping at F on each value.

I’m trying to get them as:

AA:BB:CC:DD:00:0D
AA:BB:CC:DD:00:0E
AA:BB:CC:DD:00:0F
AA:BB:CC:DD:00:11
AA:BB:CC:DD:00:12
AA:BB:CC:DD:00:13

etc.

Cheers 🙂

Answer 1

Try this for keeping it simple:

public static void main(String... args) {
    String macAddr = "AA:BB:CC:DD:";
    for (int i = 0; i < 256; i++) {
        for (int j = 0; j < 256; j++) {
            String fullAddr = String.format(macAddr + "%02X:%02X", i, j);
            System.out.println(fullAddr);
        }
    }
}

Output (abbreviated):

AA:BB:CC:DD:00:00
AA:BB:CC:DD:00:01
AA:BB:CC:DD:00:..
AA:BB:CC:DD:00:10
AA:BB:CC:DD:00:0A
AA:BB:CC:DD:00:..
AA:BB:CC:DD:00:0F
AA:BB:CC:DD:00:10
AA:BB:CC:DD:00:..
AA:BB:CC:DD:00:FF
AA:BB:CC:DD:01:00
AA:BB:CC:DD:..:..
AA:BB:CC:DD:FF:FF