event dispatch thread

all access to Swingcomponents needs to be done from a single thread—the event-dispatch thread

how to know whether you are in event dispatch thread
method1:
EventQueue.isDispatchThread()

method2:
SwingUtilities.isEventDispatchThread()

how to give tasks to event diskpatch thread:
add runnable object to event queue
method1:
EventQueue.invokeLater(Runnable runnable)
don't care when the task finishes

method2:
EventQueue.invokeAndWait(Runnable runnable)
wait until task done

ex:
Runner runner = new Runnable(){
public void run(){
JFrame frame=new JFrame();
frame.setVisible(true);
}
};
EventQueue.