4Words

import java.util.*;
import java.nio.file.*;
import java.io.*;

public class WordStatWords {
    public static void main(String[] args) {
        Map<String, Integer> words = new LinkedHashMap<String, Integer>();
        String word;
        int index;

        try {
            for (String line : Files.readAllLines(Paths.get(args[0]))) {
                index = 0;

                for (int i = 0; i < line.length(); i++) {
                    char c = line.charAt(i);

                    if (!(Character.isLetter(c) ||
                        Character.getType(c) == Character.DASH_PUNCTUATION ||
                        c == '\'')) {
                        if (index == i) {
                            index++;
                        } else {
                            word = line.substring(index, i).toLowerCase();

                            if (words.containsKey(word)) {
                                words.put(word, words.get(word) + 1);
                            } else {
                                words.put(word, 1);
                            }

                            index = i + 1;
                        }
                    }
                }

                if (index != line.length()) {
                    word = line.substring(index).toLowerCase();

                    if (words.containsKey(word)) {
                        words.put(word, words.get(word) + 1);
                    } else {
                        words.put(word, 1);
                    }
                }
            }

            PrintWriter writer = new PrintWriter(args[1], "utf8");

            try {
                words.entrySet().stream()
                    .sorted(Map.Entry.comparingByKey())
                    .forEach(entry -> writer.println(entry.getKey() + " " + entry.getValue()));
            } finally {
                writer.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}