What is the event dispatching thread?

The event dispatching thread is the thread that handles all GUI events and manages your Swing GUI. It is started somewhere in the Swing code if you have any GUI in your program. The reason it is done behind the scenes is because of simplicity - you do not have to bother with starting and managing an extra thread by yourself.

No, the EDT is not fundamentally different from other threads. And "task" is not a good word to use, because it could be confused with OS-level processes (which are also often called task). Better use Runnable, the interface used to give code to the EDT to execute via invokeLater().

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