Swing and Thread Safety
Most AWT and Swing object methods are not thread safe: invoking them from multiple threads risks thread interference or memory consistency errors. To avoid these problems, Swing standards state that all user interface components should be created and accessed only from the AWT event dispatch thread. A popular third-party Look and Feel named Substance goes as far as to refuse to instantiate any Swing component when not running within the Event Dispatch Thread, to prevent such a coding mistake from occurring.
Read more about this topic: Event Dispatching Thread
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—Ralph Waldo Emerson (1803–1882)
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