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