I want to remove duplicated characters and spaces with java 8 streams api but my code is not working :
Stream.of(sentence.toCharArray()).flatMap(x->Character.valueOf(x)).
distinct().sorted().forEach(System.out::print);
Please suggest a way use stream api for this.
This should work
sentence.chars()
.mapToObj(i -> (char)i)
.distinct()
.filter(x -> x != ' ')
.sorted()
.forEach(System.out::print);
Just a word of caution .chars() returns a IntStream and hence you need to cast it to char. You can check this post for further details on why String.chars() returns a IntStream
filter(x -> x != ' ') is better to use filter(c -> ! Character.isWhitespace(c))
.mapToObj(i -> (char)i) as far to the end as possible. Since here, all intermediate operations work (better) with int values, the best place would be right before the .forEach(System.out::print), the only operation where it matters. Or you use .forEach(i -> System.out.print((char)i)), then you don’t need to box to Character at all. You may get another performance benefit from using sentence.chars() .sorted().distinct() .filter(x -> x != ' ') .forEach(i -> System.out.print((char)i)), as .distinct() is capable of utilizing the sorted nature of the incoming data.Stream#of does not support primitive char arrays. Therefore you're getting a Stream<char[]>. It would be better to use CharSequence#chars.
sentence.chars().mapToObj(c -> (char) c).distinct().sorted().forEach(Sytem.out::print);
