RandomWriter2

import java.io.File;
import java.io.FileNotFoundException;
import java.util.*;


public class RandomWriter {

    public static void main(String[] args) throws FileNotFoundException {
        Random r = new Random();
        String sentence = readToString("huckfinn.txt");
        int k = r.nextInt(4) + 3;
        int length = 10;

        String seed = getSeed(sentence);
        String word = buildWord(seed, k, sentence);

        for (int i = 0; i < length; i++) {
            seed = getSeed(sentence);
            k = r.nextInt(4) + 3;
            word = buildWord(seed, k, sentence);
            System.out.print(word + " ");
        }
        System.out.println(".");
    }

    private static String buildWord(String seed, int k, String sentence) {
        String holder = seed;
        for (int i = 0; i < k; i++) {
            holder += nextBestLetter(holder, sentence);
        }
        return holder;
    }


    private static String nextBestLetter(String holder, String sentence) {
        String winner = "";
        Map<String, Integer> mapOfCandidates = new HashMap<String, Integer>();
        for (int i = 0; i < (sentence.length() - holder.length()); i++) {
            String checker = sentence.substring(i, i + holder.length());
            if (checker.equals(holder) && !mapOfCandidates.containsKey(sentence.substring((i + holder.length()), (i + holder.length() + 1)))) {
                mapOfCandidates.put(sentence.substring(i + holder.length(), i + holder.length() + 1), 1);
            }
            else if (mapOfCandidates.containsKey(sentence.substring((i + holder.length()), (i + holder.length() + 1)))) {
                mapOfCandidates.put(sentence.substring(i + holder.length(), i + holder.length() + 1), mapOfCandidates.get(sentence.substring(i + holder.length(), i + holder.length() + 1)) + 1);
            }
        }
        int max = 0;
        for (String s : mapOfCandidates.keySet()) {
            if (mapOfCandidates.get(s) > max && !s.equals(" ")) {
                max = mapOfCandidates.get(s);
                winner = s;
            }
        }
        return winner;
    }

    private static String getSeed(String sentence) {
        Random r = new Random();
        int index = r.nextInt(sentence.length());
        String holder = sentence.substring(index, index + 1);
        while (holder.contains(" ") || holder.contains(".") || holder.contains(",") || holder.contains("\"")) {
            index = r.nextInt(sentence.length());
            holder = sentence.substring(index, index + 1);
        }
        return holder;
    }

    public static String readToString(String path) throws FileNotFoundException {
        String wholeThing = "";
        Scanner scanner = new Scanner(new File(path));
        while (scanner.hasNext()) {
            wholeThing += scanner.next() + " ";
        }
        return wholeThing;
    }
}