File[] files = file.listFiles();
        List fileList = Arrays.asList(files);
        Collections.sort(fileList, new Comparator<File>() {
            @Override
            public int compare(File o1, File o2) {
                if (o1.isDirectory() && o2.isFile())
                    return -1;
                if (o1.isFile() && o2.isDirectory())
                    return 1;
                return o1.getName().compareTo(o2.getName());
            }
        });

 

 

 JAVA实现返回0001,0002,0003格式数字 参考:  https://www.cnblogs.com/pxblog/p/14715545.html

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