execute(JFactory::getApplication()->input->getCmd('task', ''));In this example, we create a custom controller class called `MyController` that extends the JController class. We then define a `hello()` method that will output the text "Hello, World!" when called. Finally, we create a new instance of the `MyController` class and execute its `hello()` method. The JController class is a part of the Joomla! Platform package library, which provides a set of reusable PHP classes and functions for building Joomla! components and applications.