task18.task1821

gistfile1.txt

package org.example;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Solution {
    public static void main(String[] args) throws IOException {
        try (Stream<String> stream = Files.lines(Paths.get(args[0]), StandardCharsets.UTF_8)) {
            stream
                    .flatMap(line -> Stream.of(line.split("")))
                    .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
                    .entrySet()
                    .stream()
                    .sorted(Map.Entry.comparingByKey())
                    .forEach(entry -> System.out.println(entry.getKey() + " " + entry.getValue()));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}