title: File.mkdir() and mkdirs() are creating file instead of directory
body: <p>I use the following code:</p>
  
  <pre><code>final File newFile = new File("/mnt/sdcard/test/");
  newFile.mkdir(); // if I use mkdirs() result is the same
  </code></pre>
  
  <p>And it creates an empty file! Why?</p>