title: What does this(null) mean in Java?
body: <p>I see the following code in a source file. It is a constructor but I do not understand what the code <code>this(null)</code> means here.</p>
  
  <pre><code>public DefaultFurnitureCatalog() {
      this((File)null);
  }
  </code></pre>
  
  <p>Anyone can help?</p>