Adapting multiple interfaces

I don't even understand where the database is that these methods are supposed to access information from. The only one is the HashMap of countries and their codes...

I feel like I need about 20 more tasks like this to understand how to even use adapter classes. I can do the tasks but ask me what this is actually for and I'm like 😶.

Yep it works String.format() - pass the "%010d" as argument and also the method to get the phone. then dot notate this: replaceAll("(\\d{3})(\\d{3})(\\d{2})(\\d{2})", "($1)$2-$3-$4") And do not forget to add the country code with a method and the plus sign. stringFormat replaceAll

The example given should be clarified. In the incomeData interface, one of the data fields would be completely accurate if :

int getCountryPhoneCode(); // For example: 1, or 36, or 238, etc.
// So the country code can be larger than single digit!

My code failed several times because the code expected the country code to always be a single digit, as the example originally shows. In my first code this would have resulted in the StringBuilder insert() method putting the brackets and hyphens in the wrong place for country codes of different lengths.

I'm getting back a validation error in regards to my getName implementation even though I have it setup correctly. Someone may want to review why this validation error is occurring. I even downloaded the solution to check my error and it was the same code.

Main difficulty here is the String formatting. hint - padding int with zeroes:

String.format("%03d", 7); //output: 007

did the rest of the formatting with substrings.

CodeGym, please start providing expected output. I had to go to help section to check what the correct phone number format is. This task is currently rated at 1 star (probably because it cannot go below). @All - it is +1(099)123-45-67

If you have problems with phone number formatting, StringBuffer or StringBuilder come in handy :)

Maybe it can help Use String.format() "%010d" replaceAll("(\\d{3})(\\d{3})(\\d{2})(\\d{2})", "($1)$2-$3-$4")

"If necessary, pad phone numbers with zeros to get 10 digits long (see the examples)." Which examples?