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Sun Tech Tip: Thread Handling in Swing
To increase efficiency and decrease complexity, all Swing components are designed not to be thread-safe. This simply means that all access to Swing components needs to be done from a single thread. That thread is called the event-dispatch thread, and it isn't one you create yourself. If you are unsure that your executing code is in the event-dispatch thread, you can query the EventQueue class through its static isDispatchThread() method. Alternatively, you can query the SwingUtilities class through its static isEventDispatchThread() method. The isEventDispatchThread() method acts as a proxy to the isDispatchThread() method...