说明：  在Applet中绘制图片，能采用双缓冲技术进行图片绘制，会在Applet中采用多线程进行动画显示。能在Applet中实现动画的平滑显示，避免闪烁现象在Applet窗口中显示一只鸭子图片，要求这只鸭子以每秒100帧的速率水平移动，移到窗口边界再返回移动。在窗口中点击鼠标，鸭子停止移动；再次点击鼠标，鸭子恢复移动
(Applet to draw pictures using double buffering techniques for drawing the picture, multi-threaded animation in Applet. Can be implemented in Applet animation smoothing, to avoid flicker in the Applet window to display the picture of a duck, the duck to a rate of 100 per second moving horizontally, move the window border and then return to the mobile. The click of a mouse in the window, duck stops moving again the click of a mouse, duck recovery move)