More Java 17 by Kishori Sharan & Peter Späth

Author:Kishori Sharan & Peter Späth
Language: eng
Format: epub
ISBN: 9781484271353
Publisher: Apress

Es count: 4

The code maps the strings to IntStream. Note that the chars() method of the String class returns an IntStream, not a Stream<Character>. The output of the map() method is Stream<IntStream>. The flatMap() method maps the Stream<IntStream> to Stream<Stream<Character» and, finally, flattens it to produce a Stream<Character>. So, the output of the flatMap() method is Stream<Character>. The filter() method filters out any characters that are not an E or e. Finally, the count() method returns the number of elements in the stream. The main logic is to convert the Stream<String> to a Stream<Character>. You can achieve the same using the following code as well:long count = Stream.of("Ken", "Jeff", "Ellen")

.flatMap(name ->

IntStream.range(0, name.length())

.mapToObj(name::charAt))

.filter(ch -> ch == 'e' || ch == 'E')

.count();

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