关于事件调度线程

Question

I'm reading some articles about Event Dispatch Thread in java. As it implies the creation of GUI and all the events of GUI components should performed within this thread . if take a look at some code which generate on net beans IDE when create a JFrame I can agree with a part of this comment. Because it includes some code that direct the GUI creation to the EDT like java.awt.EventQueue.invokeLater(new Runnable().. ...

Ex:
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Temp().setVisible(true);
        }
    });
}

But expressions that we write on events handling methods does not have that kind of directing statements.

Ex
private void btnTodayActionPerformed(java.awt.event.ActionEvent evt) {                                         
    xxxxxxxxxxxxxxxxx ;
    xxxxxxxxxxxxxxxxxxxxxxxxxxx;
} 

Where is that? Or is it done by the compiler?? Please be kind to help me .. this will be some silly question…

Answer 1

As the name implies, all UI events, including click events, are raised on the event dispatch thread.

What the event dispatch thread actually does is run an OS-level message loop to be notified of UI events, then dispatch those events to the appropriate Swing components.

Answer 2

事件总是在EDT上引发，因此您为回调编写的任何代码也都在EDT上，仅当您已经在使用其他线程时才需要invokeLater（或类似代码）（例如，不应在线程上执行长任务） EDT，因为它们冻结了整个接口，相反，它们应该在自己的线程上执行，并定期使用invokeLater更新接口）