The event dispatching thread (EDT) is a background thread used in Java to process events from the Abstract Window Toolkit (AWT) graphical user interface event queue. It is an example of the generic concept of event-driven programming, that is popular in many other contexts than Java, for example, web browsers, or web servers.
The events are primarily update events that cause user interface components to redraw themselves, or input events from input devices such as the mouse or keyboard. The AWT uses a single-threaded painting model in which all screen updates must be performed from a single thread. The event dispatching thread is the only valid thread to update the visual state of visible user interface components. Updating visible components from other threads is the source of many common bugs in Java programs that use Swing.[1] The event dispatching thread is called the primordial worker in Adobe Flash and the UI thread in SWT, .NET Framework and Android.
^This problem is not specific to Java Swing. There is the same issue in most Widget toolkits, as for example Windows Forms, where the BackgroundWorker class performs the same purpose as SwingWorker in Java.
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