Use CodeInsight on existing code
Use CodeInsight to find out about members or parameters without changing any code! For example, if you have <code>System.out.println(&quot;&quot;);</code>
 in your code, position your cursor after the period of &quot;out.&quot; Press <kbd>Ctrl+Space</kbd>
 to get the members of <code>out</code>
 or position the cursor after the opening parenthesis of <code>println(&quot;&quot;)</code>
 and press <kbd>Ctrl+Shift+H</kbd>
 to get the list of parameters.