what does this statement mean

Question

unlike SwingUtilities.invokeAndWait(), the event thread is permitted to call SwingUtilities.invokeLater(). I cannot understand this clearly.

Please help me in this.

Answer 1

Another thread (not the main Swing event thread) can call invokeAndWait to wait for the Swing event thread to be ready to run some action. However, the Swing event thread cannot wait for itself. So it calls invokeLater to put the action in a queue for later execution.