SwingUtilities.invokeLater（）

Question

在任何swing应用程序中，我如何感觉到SwingUtilities.invokeLater（）的重要性。请提供一些代码示例。

Answer 1

Whenever you need to update something inside your GUI you should do it through the AWT Event Thread .

This because AWT (and Swing on top) has its own thread that manages everything of a GUI. Without it the graphical interface couldn't handle events and similar things in an asynchronous way while your program is doing something else.

So for example if you have a long task declared in a Thread :

public void MyThread extends Thread
{
  class GUIUpdate implements Runnable
  {
    GUIUpdate(String msg)
    {
      ...
    }

    public void run()
    {
      guiElement.appendText(msg);
    }
  }

  public void run()
  {
     while (finished)
     {
        //do long calculations

        //send partial output to gui
        SwingUtilities.invokeLater(new GUIUpdate("something has changed!"));
     }
   }
 }