Многопоточность

private void button1action() throws InterruptedException {
        String path = parent.tfield2.getText();
        File file = new File(path);
        file.mkdir();
        File[] fileList = file.listFiles();
        System.out.println(fileList.length);
        long time1 = System.currentTimeMillis();
 
 
        for (File f: fileList) {
            CountThread thread = new CountThread(f);
            thread.t.join();
        }
 
 
        long time2 = System.currentTimeMillis();
        long time = time2 - time1;
        EnterWindow.tarea.setText("");
        EnterWindow.tarea.repaint();
        EnterWindow.tarea.setText(EnterWindow.text);
        System.out.println("Время с потоками:    " + time);
 
    }

private void button3action() throws IOException {
        String path = parent.tfield2.getText();
        File file = new File(path);
        file.mkdir();
        File[] fileList = file.listFiles();
        System.out.println(fileList.length);
 
        String text = "";
 
        long time1 = System.currentTimeMillis();
        for (File f: fileList) {
            Reader freader = new FileReader(f);
            BufferedReader reader = new BufferedReader(freader);
 
            int stringNumber = 0;
 
            while (reader.readLine()!=null) { stringNumber++; }
 
            text = text  + f.getName() + " : " + stringNumber + System.getProperty("line.separator");
 
            reader.close();
            freader.close();
        }
        long time2 = System.currentTimeMillis();
        long time = time2 - time1;
 
        EnterWindow.tarea.setText("");
        EnterWindow.tarea.setText(text);
        System.out.println("Время без потоков   " + time);
    }