Question

I have a product number which I would like to format using a mask.

Example:

String productNumber = "0913014316";
String mask = "XX.XXX.XXX.XXX";

How do I get this following output: 09.13.014.316?

Can I use String.format()? Or maybe something else on the Android?

Thank you

Answer 1

I think writing this yourself instead of waiting for an answer here would be faster 🙂

You could do something like (pseudocode):

StringBuilder out = new StringBuilder();
int j=0;
for (int i = 0; i< mask.lenght ;  i++) {
   if (mask[i] == 'X') {
       out.append(producNumber[j];
       j++;
   }
   else {
       out.append('.');
       i++;
   }
}
return out.toString();