What is the mechanism for storing names in an array?

Question

Java

What is the technique for storing names in an array?
There is a list of 12,000 thousand names, they need to be sorted by name and transferred to a dynamic array, so that each line
of the array corresponds to one letter that the names begin with?

Answer 1

Each letter corresponds to a new row in the array.

If there is a new array string for each letter, then am I correct in understanding that the names in the string should be concatenated, or should there just be a list of names for each letter?
I would use HashMap<Character, List<String>>
Put in mapu Character(your letters). And for the corresponding letter, add names to List<String>
If you need a variant with concatenation, then you can HashMap<Character, String>. Accordingly, when adding, you get a string and concatenate the new name with with the string.