How to manipulate the string using stream API in Java. which api method is suitable

Question

How to manipulate the string using stream API in Java. which api method is suitable.

I am trying some Java 8 features.

so lets say I have list of string

List<String> str = Arrays.asList("Hello World","Welcome America");
        List<String> res = str.stream()
                          .map(st -> st.split(" "))
                          .collect(Collectors.)); // here after Collectors what should I use.

my output should be like : [Hello Welcome, Wrold America]

hwrw by using map i am transforming the list but I am not getting any method to collect that. any help so i can do it by using stream.

shmosel · Accepted Answer · 2022-06-10 04:43:06Z

4

It's not very clean or efficient, but here's one way:

List<String> res = IntStream.range(0, str.size())
        .mapToObj(i -> str.stream()
                .map(s -> s.split(" ")[i])
                .collect(Collectors.joining(" ")))
        .collect(Collectors.toList());

Ideone Demo

answered Jun 10, 2022 at 4:43

shmosel

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1 Comment

David Over a year ago

thanks for the answer, it works. let me see what Intstream do. also why this is not right aproch to do. i know the complexity and both traditional way and by using stream api. can you please give some light on that.

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