How to migrate old J prefix classes to new Joomla classes

Question

I am trying to migrating old classes names to the new ones available on classmap.php
However after renaming the classes I am having these errors:
Class 'Text' not found //JText works

Class 'BaseController' not found //JControllerLegacy works

I am new to joomla but for my understanding I only need joomla 3.x, which I am running.
Am I missing some import?

Grant G · Answer

You need to specify the namespace before you use them, so for your examples above:
use JoomlaCMSLanguageText;
use JoomlaCMSMVCControllerBaseController;

class YourClass extends BaseController {
    echo Text::_('YOUR_CONSTANT');
}

Otherwise, you can do it like this, which is going to get tedious pretty quick:
class YourClass extends JoomlaCMSMVCControllerBaseController {
    echo JoomlaCMSLanguageText::_('YOUR_CONSTANT');
}

How to migrate old J prefix classes to new Joomla classes

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