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Did I get it right? EDT is the main thread of GUI. To start a long operation, it’s preferred to run it in new thread. So why do we need to use EventQueue for that? Why can’t we simply create and run new thread just like in non-Swing programs?
There is nothing that says you need to use the EventQueue if you are running a long running operation in the background. The purpose of the queue here is to utilize if you have to update the UI that the long running process is complete.
When the process is complete you would put some kind of runnable notification on the Event Queue to notify the UI of completion.