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List<File> files = Arrays.asList(new File("D:/").listFiles());
Collections.sort(files, 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());
    }
});

for(File f : files)
    System.out.println(f.getName());