title: Java 8 to Java 7 Code
body: <p>Can someone help me downport this to Java 7? And can you explain how you did it?</p>
  
  <pre><code>Stream.of(arenaDirectory.list()).filter((file) -&gt;
          Stream.of(new File(arenaDirectory, file).list()).filter((childName) -&gt; childName.equals(DATA_FILE_NAME)).count() &gt; 0
      ).map((file) -&gt; new File(arenaDirectory, file)).forEach((arenaFolder) -&gt; {
  }
  </code></pre>
  
  <p>The arena directory is a folder.</p>