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  1. import java.util.*;
  2. import java.util.stream.Stream;
  3.  class Ideone
  4. {
  5.   public static void main(String[] args)
  6.   {
  7.    int number=55;
  8.  
  9.  
  10.     Stream.iterate(String.valueOf(number),
  11.                n -> String.valueOf(n.codePoints().map(Character::getNumericValue).sum()))
  12.       .filter(s -> s.length()==1)
  13.       .findFirst().ifPresent(System.out::println);
  14.  
  15.   }
  16. }
  17.  
Success #stdin #stdout 0.22s 320768KB
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https://ideone.com/iI8slY
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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