Why do people run Java GUI's on the Event Queue

Question

In Java, to create and show a new JFrame, I simply do this:

public static void main(String[] args) {
   new MyCustomFrameClass().setVisible(true         


        

Answer 1

This line is modifying a Swing component since your custom frame is a subclass of JFrame:

new MyCustomFrameClass().setVisible(true);

Generally, you should never modify a Swing component unless you are on the Event Dispatch Thread (EDT).

The following code will run whatever is in the Runnable on the EDT.

EventQueue.invokeLater(Runnable);

Now, the setVisible(true) call will be on the EDT as it should.