javaaaaaaa

    private String linia;
    public ArrayList<Double> dane = new ArrayList<>();
    int a =10;

  JFileChooser jfc = new JFileChooser(".");




        if(jfc.showOpenDialog(this)==JFileChooser.APPROVE_OPTION){
            File  f = jfc.getSelectedFile();
            try {
                FileReader fr = new FileReader(f);
                BufferedReader br = new BufferedReader(fr);
                int i = 0;
                while((linia = br.readLine())!=null){
                    dane.add(Double.parseDouble(linia));
                    System.err.println(dane.get(i));
                    i++;
                    jTextArea1.append(linia+"\n");

                    String output = "";
                    output+="blbabka";

                }





            } catch (FileNotFoundException ex) {
                Logger.getLogger(widok.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IOException ex) {
                Logger.getLogger(widok.class.getName()).log(Level.SEVERE, null, ex);
            }


        }