How to create sublist based on condition in Java

Question

I have a list of String

List<String> strings = new ArrayList<>(Arrays.asList("C", "C++", "Java"));

And now I want to create another list, which would contain all elements of strings that contain "C". So I believe that the condition would look like this:

(String a) -> a.contains("C");

What is the fastest and most clear way to do that?

strings.stream().filter(t -> t.contains("C")).collect(Collectors.toList()) — MC Emperor
– MC Emperor, Commented May 27, 2019 at 19:40
Another possibility: strings.removeIf(a -> !a.contains("C")) (Note that this modifies the strings List itself.) — VGR
– VGR, Commented May 28, 2019 at 0:09

Jacob G. · Accepted Answer · 2019-05-27 19:40:44Z

4

I recommend streaming the List and then using Stream#filter to filter through any elements that contain the letter 'C':

List<String> filteredList = strings.stream()
        .filter(s -> s.contains("C"))
        .collect(Collectors.toList());

Printing filteredList will yield the following:

[C, C++]

answered May 27, 2019 at 19:40

Jacob G.

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