package com.company;

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

public class Main {
    public static void main(String[] args){
        final String source = "resources\\lines.txt";
        File file = new File(source);
        try {
            BufferedReader reader = new BufferedReader(new FileReader(file));
            FileWriter fw = new FileWriter(file,true);
            PrintWriter writer = new PrintWriter(fw,true);

            ArrayList<String> text = new ArrayList<String>();

            String line = reader.readLine();
            while (line!=null){
                line=line.toUpperCase();
            text.add(line);
                line = reader.readLine();
            }
            reader.close();

            for (int i=0;i<text.size();i++){
            writer.println(text.get(i));
            }
            writer.close();

        } catch (FileNotFoundException e) {
            System.out.println("File not found");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}