Swing event handling code runs on a special thread known as the event dispatch thread. Most code that invokes Swing methods also runs on this thread. This is necessary because most Swing object methods are not 'thread safe': invoking them from multiple threads risks. Some Swing component methods are labelled 'thread safe' in the API specification; these can be safely invoked from any thread.

All other Swing component methods must be invoked from the event dispatch thread. Programs that ignore this rule may function correctly most of the time, but are subject to unpredictable errors that are difficult to reproduce. It's useful to think of the code running on the event dispatch thread as a series of short tasks.

Jump to GUI Thread and Worker Thread - As mentioned, each program has one thread when it is started. This thread is called the 'main thread' (also known as the 'GUI thread' in Qt applications). The Qt GUI must run in this thread. All widgets and several related classes, for example QPixmap, don't work in. 2008-12-23 Updating the UI from a thread - The simplest way. Be to use a timer control or a System.Timer object which are special threads that.

Most tasks are invocations of event-handling methods, such as ActionListener.actionPerformed. Other tasks can be scheduled by application code, using invokeLater or invokeAndWait. Tasks on the event dispatch thread must finish quickly; if they don't, unhandled events back up and the user interface becomes unresponsive. If you need to determine whether your code is running on the event dispatch thread, invoke.

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