title: What About using import java.* for using all sub-packages under the package 'java'?
body: <pre><code>import java.*;
  </code></pre>
  
  <p>Why cannot I do this importing ??
  Instead of importing the all class in a particular sub-package of the package 'java' , I tried to import all the sub-packages under the the 'java' package .</p>
  
  <p>How can I import all the built-in classes </p>