title: What Exacly (args.length>0) means?
body: <p>This may be simple to you people but as i am new to java, so i want know actually what is 
   going on in the following part?</p>
  
  <pre><code>if (args.length &gt; 0) {
      file = args[0];
  }
  
  
  public class DomTest1 {
      public static void main(String[] args) {
          String file = "test1.xml";
          if (args.length &gt; 0) {
              file = args[0];
          }
      }
  }
  </code></pre>