Fonction : où réinitialiser le compteur

import java.util.Arrays;

public class MotDico {
    private final String mot;
    private String lettresTriees;

    public MotDico(String mot) {
        this.mot = mot;
    }

    public String getMot(){
        return mot;
    }

    public String getLettresTriees(){
        if (lettresTriees == null) {
            char[] lettres = mot.toCharArray();
            Arrays.sort(lettres);
            lettresTriees = new String(lettres);
        }
        return lettresTriees;
    }

    public int length(){
        return mot.length();
    }

    public boolean contains(MotDico mot2) {
        if (length() < mot2.length())
            return false;
        String lettres = getLettresTriees();
        String lettres2 = mot2.getLettresTriees();
        int i = 0, i2 = 0;
        while (i < length() && i2 < mot2.length()) {
            if (lettres.charAt(i) == lettres2.charAt(i2)) {
                i++;
                i2++;
            } else if (lettres.charAt(i) < lettres2.charAt(i2)) {
                i++;
            } else {
                return false;
            }
        }
        return i2 == mot2.length();
    }

    @Override
    public String toString(){
        return mot;
    }
}

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

public class Dico {
    private static final Random random = new Random();
    private final List<MotDico> mots;

    public Dico(String fileName) {
        mots = new ArrayList<>();
        try {
            for (String line : Files.readAllLines(Paths.get(fileName))) {
                mots.add(new MotDico(line));
            }
        } catch (IOException e) {
            throw new UncheckedIOException("Impossible de lire " + fileName, e);
        }
    }

    public List<MotDico> getAllMots(){
        return Collections.unmodifiableList(mots);
    }

    public List<MotDico> getAllMotsAvec(String lettres) {
        MotDico ensemble = new MotDico(lettres);
        List<MotDico> result = new ArrayList<>();
        for (MotDico mot : mots) {
            if (ensemble.contains(mot)) {
                result.add(mot);
            }
        }
        return Collections.unmodifiableList(result);
    }

    public MotDico getRandomMotAvec(String lettres) {
        List<MotDico> liste = getAllMotsAvec(lettres);
        if (liste.isEmpty())
            return null;
        return liste.get(random.nextInt(liste.size()));
    }
}

public class TestDico {
    public static void main(String[] args) {
        MotDico jour = new MotDico("jour");
        System.out.println(jour.contains(jour)); // true

        MotDico bonjour = new MotDico("bonjour");
        System.out.println(bonjour.contains(jour)); // true
        System.out.println(jour.contains(bonjour)); // false

        MotDico matin = new MotDico("matin");
        System.out.println(jour.contains(matin)); // false
        System.out.println(matin.contains(jour)); // false

        Dico dico = new Dico("E:/mots.txt");
        System.out.println(dico.getAllMotsAvec("bonjour")); // bon, jour, bonjour, juron, ...
        System.out.println(dico.getRandomMotAvec("bonjour")); // brun
    }
}

Exception in thread "main" java.io.UncheckedIOException: Impossible de lire E:/mots.txt
 at com.company.Dico.<init>(Dico.java:20)
 at com.company.Dico.main(Dico.java:63)
Caused by: java.nio.file.NoSuchFileException: E:\mots.txt
 at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85)
 at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
 at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
 at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:235)
 at java.base/java.nio.file.Files.newByteChannel(Files.java:375)
 at java.base/java.nio.file.Files.newByteChannel(Files.java:426)
 at java.base/java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:420)
 at java.base/java.nio.file.Files.newInputStream(Files.java:160)
 at java.base/java.nio.file.Files.newBufferedReader(Files.java:2916)
 at java.base/java.nio.file.Files.readAllLines(Files.java:3396)
 at java.base/java.nio.file.Files.readAllLines(Files.java:3436)
 at com.company.Dico.<init>(Dico.java:16)
 ... 1 more

Dico dico = new Dico("C:\\Users\\Slash\\IdeaProjects\\2-somme\\src\\com\\company\\mots.txt");

Exception in thread "main" java.io.UncheckedIOException: Impossible de lire C:\Users\Slash\IdeaProjects\2-somme\src\com\company\mots.txt
	at com.company.Dico.<init>(Dico.java:21)
	at com.company.Dico.main(Dico.java:71)
Caused by: java.nio.file.NoSuchFileException: C:\Users\Slash\IdeaProjects\2-somme\src\com\company\mots.txt
	at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85)
	at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
	at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
	at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:235)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:375)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:426)
	at java.base/java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:420)
	at java.base/java.nio.file.Files.newInputStream(Files.java:160)
	at java.base/java.nio.file.Files.newBufferedReader(Files.java:2916)
	at java.base/java.nio.file.Files.readAllLines(Files.java:3396)
	at java.base/java.nio.file.Files.readAllLines(Files.java:3436)
	at com.company.Dico.<init>(Dico.java:17)
	... 1 more

static String getComplement(String ensemble, String mot){

        String complement = ensemble;

        for(char c:mot.toCharArray()){
            // supprime la lettre (dans ensemble) équivalente à la lettre c (dans mot)
            complement=complement.replaceFirst(""+c, "");
        }
        return complement;

    }

public String getComplement2(String ensemble, String mot){

        String complement = ensemble;

        for(char c:mot.toCharArray()){
            // supprime la lettre (dans ensemble) équivalente à la lettre c (dans mot)
            complement=complement.replaceFirst(""+c, "");
        }
        return complement;

    }

String complement = complement.getComplement2();