Vtora Zadacha

import java.io.*;
import java.util.ArrayList;

public class RUnner {
    public static void main(String[] args) throws IOException {
        File izvor = new File("C:\\Users\\David\\Desktop\\test\\izvor.txt");
        File destinacija = new File("C:\\Users\\David\\Desktop\\test\\destinacija.txt");

        InputStream chitach = new FileInputStream(izvor);
        OutputStream zapishuvach = new FileOutputStream(destinacija);
        BufferedReader chitachDestinacija = new BufferedReader(new FileReader(destinacija));

        ArrayList<Integer> lista = new ArrayList<>();

        int bajt = 0;

        while ((bajt=chitach.read())!= -1){
            lista.add(bajt);
        }

        for (int i = lista.size() -1; i >= 0; i--) {
            zapishuvach.write(lista.get(i));
        }

        chitach.close();
        zapishuvach.flush();
        zapishuvach.close();

        String celosenText = "";

        while ((celosenText=chitachDestinacija.readLine())!=null){
            System.out.println(celosenText);
        }
        chitachDestinacija.close();
    }
}


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import java.io.*;
import java.util.ArrayList;

public class RUnner {
    public static void main(String[] args) throws IOException {
        File izvor = new File("C:\\Users\\David\\Desktop\\test\\izvor.txt");
        File destinacija = new File("C:\\Users\\David\\Desktop\\test\\destinacija.txt");

        InputStream chitach = new FileInputStream(izvor);
        OutputStream zapishuvach = new FileOutputStream(destinacija);

        ArrayList<Integer> lista = new ArrayList<>();

        int bajt = 0;

        while ((bajt=chitach.read())!= -1){
            lista.add(bajt);
        }

        for (int i = lista.size() -1; i >= 0; i--) {
            zapishuvach.write(lista.get(i));
        }

        chitach.close();
        zapishuvach.flush();
        zapishuvach.close();
    }
}