[数据结构与算法]rename by number 有些文件删除了有序的名字变了让他们重写有序

public class RenameBynumber {
    public static void main(String[] args) {
        String mpPath = "D:\\15\\15";
        File file = new File(mpPath);
        File[] files = file.listFiles();
        ArrayList<Long> list = new ArrayList<>();
        HashMap<Long, File> map = new HashMap<>();
        for (int i = 0; i < files.length; i++) {
            String name = files[i].getName();
            String[] split = name.split("\\.");
//            System.out.println(split[0]);
            map.put(Long.valueOf(split[0]), files[i]);
            list.add(Long.valueOf(split[0]));

        }
        Collections.sort(list);


        for (int i = 0; i < list.size(); i = i + 1) {

            File oldName = new File(map.get(list.get(i)).getAbsolutePath());
            File newName = new File("D:\\15\\rename\\" + String.valueOf(i+1) + ".mp3");
            System.out.println("-----------");
            System.out.println(oldName+"->"+newName);
            System.out.println(oldName.renameTo(newName));

        }


    }