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Write a Java function definition that is equivalent to the following Cinnameg function definition. 
  Define 
    sumDigits(n: Integer): Integer by

    case sumDigits(n) = 0   when n == 0
    case sumDigits(n) = n `mod` 10 + sumDigits(n `div` 10)
  %Define

 

  [Language: Java  Kind: function definition]