//sort array listOfFiles by time (oldest to newest)
    File folder = new File(dbBackupLocation + "/" + dbHost);
    File[] listOfFiles = folder.listFiles();
    Arrays.sort(listOfFiles, new Comparator<File>() {
        @Override
                    public int compare(File f1, File f2) {
            return Long.valueOf(f1.lastModified()).compareTo(f2.lastModified());
        }
    });

File folder = new File(dbBackupLocation + "/" + dbHost);
    File[] listOfFiles = folder.listFiles();
    if (listOfFiles != null && listOfFiles.length > 0) {
        // The array isn't empty.
        Arrays.sort(listOfFiles, new Comparator<File>() {
            @Override
            public int compare(File f1, File f2) {
                return Long.valueOf(f1.lastModified())
                        .compareTo(f2.lastModified());
            }
        });
    }

File folder = new File(dbBackupLocation + "/" + dbHost);
File[] listOfFiles = folder.listFiles();
if (listOfFiles != null && listOfFiles.length > 0) {
  // The array isn't empty.
  Arrays.sort(listOfFiles, new Comparator<File>() {
    @Override
    public int compare(File f1, File f2) {
      return Long.valueOf(f1.lastModified())
          .compareTo(f2.lastModified());
    }
  });
}

Runtime.getRuntime().exec("/bin/bash -c du /path/to/Michaels/folder");

File folder = new File(dbBackupLocation + "/" + dbHost);
if (folder != null && folder.exists() && folder.isDirectory()) {
    File[] listOfFiles = folder.listFiles();
    if (listOfFiles != null && listOfFiles.length > 0) {
        Arrays.sort(listOfFiles, new Comparator<File>() {
            @Override
            public int compare(File f1, File f2) {
                return Long.valueOf(f1.lastModified()).compareTo(f2.lastModified());
            }
        });
    }

    //display the files
    for (File f : listOfFiles) {
        System.out.println(f);
    }
}