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ZipWithのような何か
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| package test; | |
| import java.util.List; | |
| import java.util.function.BiFunction; | |
| import java.util.stream.Collectors; | |
| import java.util.stream.IntStream; | |
| import java.util.stream.Stream; | |
| /** | |
| * @author skht777 | |
| */ | |
| public class StrZipWith { | |
| public static <T, S, U> List<U> zipWith(BiFunction<T, S, U> reduce, List<T> f, List<S> s) { | |
| return zipWith(reduce, f, s, IntStream.of(f.size(), s.size()).min().getAsInt() - 1).collect(Collectors.toList()); | |
| } | |
| public static String StrZipWith(BiFunction<String, String, String> reduce, String f, String s) { | |
| return zipWith(reduce, strToList(f), strToList(s)).stream().collect(Collectors.joining()); | |
| } | |
| private static <T, S, U> Stream<U> zipWith(BiFunction<T, S, U> reduce, List<T> f, List<S> s, int idx) { | |
| return idx < 0 ? Stream.empty() : Stream.concat(zipWith(reduce, f, s, idx - 1), Stream.of(reduce.apply(f.get(idx), s.get(idx)))); | |
| } | |
| private static List<String> strToList(String s) { | |
| return IntStream.range(0, s.length()).mapToObj(i -> String.valueOf(s.charAt(i))).collect(Collectors.toList()); | |
| } | |
| public static void main(String[] args) { | |
| final String pt = "パトカー"; | |
| final String tx = "タクシー"; | |
| System.out.println(StrZipWith(((p, t) -> p + t), pt, tx)); | |
| } | |
| } |
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