FileManager.java

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

public class FileManager {
    private File file;

    public FileManager(File file){
        this.file = file;
    }

    public ArrayList<String> load() throws Exception {
        ArrayList<String> als = new ArrayList<>();
        Scanner scf = new Scanner(file);
        while(scf.hasNextLine()){
            String line = scf.nextLine().trim();
            if (line.length() > 0)
                als.add(line);
        }
        scf.close();
        return als;
    }

    public void save(ArrayList<String> als) throws Exception {
        FileWriter fw = new FileWriter(file);
        for(int i = 0; i < als.size(); ++i){
            fw.write(als.get(i) + "\n");
        }
        fw.close();
    }

    /*
    public static void main(String [] args){
        try {
            ArrayList<String> als = new ArrayList<>();
            als.add("Labas1");
            als.add("Labas2");
            als.add("Labas3");

            FileManager fm = new FileManager(new File("labas.txt"));
            fm.save(als);

            FileManager fm2 = new FileManager(new File("labas.txt"));
            ArrayList<String> als2 = fm.load();

            FileManager fm3 = new FileManager(new File("labas2.txt"));
            fm3.save(als2);
        } catch(Exception e){
            System.out.println(e);
        }
    }
    */
}