File

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Scanner;


public class File extends Thread {

    ArrayList<String> filelist;


    File(ArrayList<String> filelist) {
        this.filelist = new ArrayList<String>();
    }

    public static ArrayList<String> readFile(String name) throws FileNotFoundException {
        Scanner scanner = null;
        scanner = new Scanner(new BufferedReader(new FileReader(name)));
        ArrayList<String> filelist = new ArrayList<String>();
        while (scanner.hasNextLine()) {
            filelist.add(scanner.nextLine());
        }
        scanner.close();
        return filelist;

    }

    public void observeFiles(String name) throws FileNotFoundException, InterruptedException {
        ArrayList<String> baseFile;
        ArrayList<String> observableFile;
        boolean b = true;
        while (b) {
            baseFile = File.readFile(name);
            Thread.sleep(5000);
            observableFile = File.readFile(name);
            if (!baseFile.equals(observableFile)) {
                System.out.println("There are a mistake");
            } else {
                System.out.println("OK");
            }
            baseFile.clear();
            baseFile.addAll(observableFile);
        }
    }

    public void run() {
        try {

            this.observeFiles(name);

        } catch (FileNotFoundException ex) {
            System.out.print("There are no files with such name!");
            return;
        } catch (InterruptedException ex) {
            System.out.print("fff");
            return;
        }
    }

}