Find duplicate values from a string with Java8 features

This is another very common question. It can be done in one line through Java8.

String myString = "This is for test automation questions";

String distinctChar =  myString

                       .chars()

                       .mapToObj(c -> (char) c)

                       .collect(Collectors.toSet())

                       .stream()

                       .map(String::valueOf)

                        .collect(Collectors.joining());

System.out.println("String after duplicates removed: "

        +  String.valueOf(disticntChar));