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

public class Filesystest {
    File f = new File("test.txt");
    List<String> file = new ArrayList<>();
    String Docname;
    PrintWriter pw = null;

    void Docnm () {
        Scanner name = new Scanner(System.in);
        Docname = name.nextLine();
    }

    void FWrite() {
        String name = Docname;
        try {
            FileWriter FWriter = new FileWriter("test.txt", true);
            pw = new PrintWriter(FWriter);
            pw.println(name);
            pw.close();
        }
        catch(Exception e) {
            System.out.println("error Write");
        }
    }

    void Freader() {
        try {

            Scanner Fread = new Scanner(f);

            while(Fread.hasNext()) {
                file.add(Fread.next());
            }
            Fread.close();
        }
        catch (Exception e) {
            System.out.println("error read");
        }
    }


    void showALl () {
        for (int i = 0; i<file.size(); i++) {
            System.out.printf("%s", file.get(0));
        }
    }

    void SearchFile () {
        for (int i=0; i<file.size(); i++) {
            if (file.get(i) == file.get(3)) {
                System.out.println("file found :" + file.get(i));
            }
        }
    }


    //dont work
    /*void RemoveFile () {
        for (int i=0; i<file.size(); i++) {
            if (file.get(i) == file.get(3)) {
                System.out.println("file deleted :" + file.get(i));
                file.remove(i);
            }
        f.delete();
        File x = new File("test.txt");
        for (int z=0; z<file.size(); z++) {
            pw.println(file.get(z));
        }
        }
    } */
    void ReplaceFile () {}
}