HomeWork7(Generics and Collections)(3)

CheckLetters.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;

public class CheckLetters {

    private char letter;
    private int count;

    public CheckLetters() {
    }

    public CheckLetters(int count, char letter) {
        this.count = count;
        this.letter = letter;
    }

    public char getLetter() {
        return letter;
    }

    public void setLetter(char letter) {
        this.letter = letter;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public String readText(File file) {
        StringBuffer sb = new StringBuffer();
        String st = null;
        try (BufferedReader br = new BufferedReader(new FileReader(file))) {
            String str = "";
            for (; (str = br.readLine()) != null;) {
                sb.append(str);
                sb.append(System.lineSeparator());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        st = sb.toString();
        return st;
    }

    public ArrayList<?> count(File file) {
        String alph = "abcdefghijklmnopqrstuvwxyz";
        ArrayList<CheckLetters> list = new ArrayList<>();
        String st = readText(file);
        for (int i = 0; i < alph.length(); i += 1) {
            letter = alph.charAt(i);
            char[] a = st.toCharArray();
            for (int j = 0; j < st.length(); j += 1) {
                if (Character.isLetter(a[j])) {
                    if (a[j] == letter) {
                        count += 1;
                    }
                }
            }
            list.add(new CheckLetters(getCount(), letter));
            count = 0;
        }
        Collections.sort(list, (CheckLetters clOne, CheckLetters clTwo) -> clOne.count > clTwo.count ? -1 : (clOne.count < clTwo.count) ? 1 : 0);
        return list;
    }

    @Override
    public String toString() {
        return "CheckLetters{" + count + " = " + letter + '}' + "\n";
    }

}

Main.java

import java.io.File;

public class Main {

    public static void main(String[] args) {

        CheckLetters cl = new CheckLetters();
        File text = new File("a.txt");
        System.out.println(cl.count(text));
    }

}