title: try/catch versus throws Exception
body: <p>Are these code statements equivalent?
  Is there any difference between them?</p>
  
  <pre><code>private void calculateArea() throws Exception {
      ....do something
  }
  </code></pre>
  
  <hr>
  
  <pre><code>private void calculateArea() {
      try {
          ....do something
      } catch (Exception e) {
          showException(e);
      }
  }
  </code></pre>