title: Why we use init() rather Constructor
body: <p>why do we need <code>init()</code> rather than a <code>constructor</code>?</p>
  
  <p>Please answer in reference of <code>Servlet</code> and <code>Applet</code>.<br>
  How does the <code>init()</code> of <code>Applet</code> differ from <code>Servlet</code>?</p>