In which thread is the event loop created?

The event loop in Java is created in the thread where it is initialized. For example, in Swing, the event loop runs in the main (Event Dispatch Thread), which is responsible for handling GUI events.

If you create an event loop manually (for example, in asynchronous libraries), it will run in the thread where the corresponding method to start the event processing loop is called.

Important: the event loop is not automatically created in a separate thread; it needs to be started in the appropriate context, usually in the main UI thread for graphical applications.