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How can I modify getCardsByRank function in order to return a Stream
with all the DISTINCT cards of that rank,
alphabetically SORTED ?

E.g. for a list that contains "2H", "2S", "TH" and the rank is '2'
the result should be a stream containing "2H" and "2S" in this order.

What I have tried:

I have tried this:

public static Stream<String> getCardsByRank(List<String> cards, char rank)
                    .filter(s -> s.charAt(1) == rank)

but it did not work...
Updated 31-May-21 6:56am
Richard MacCutchan 31-May-21 11:40am     CRLF
"but it did not work." Please do not say that; it means nothing to us. Show the actual data you are using, and the results you get.
BZR1990 31-May-21 11:45am    
It means that when I call the method, it displays an empty list .... sorry if I was not understood, I am new to programming :)

1 solution

The card number is item 0 of the string not item 1.
                    .filter(s -> s.charAt(0) == rank)
//                                        ^
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