这样做的原因是当您指示JVM显示动画时，JVM将清除屏幕，显示窗口，绘制屏幕并再次显示。

Why? When you instruct JVM to display an animation, JVM will clear the screen, show the window, paint the screen, and show it again.

youdao

我们向您显示了完整的ListBox窗口小部件类(当然，为了便于显示，这些类已经清除了)，这使您可以了解我们已经发现的对操作列表框有用的许多方法。

We show you our entire ListBox widget class (cleaned up for presentation purposes, of course). This gives you an idea of the many methods we've found useful for manipulating list boxes.

youdao

我们向您显示了完整的ListBox窗口小部件类(当然，为了便于显示，这些类已经清除了)，这使您可以了解我们已经发现的对操作列表框有用的许多方法。

We show you our entire ListBox widget class (cleaned up for presentation purposes, of course). This gives you an idea of the many methods we've found useful for manipulating list boxes.

youdao