在Applet画面中用红色大号字绘制“欢迎光临”4字，让其自左向由移动，移动到右边，再重新至左边。但绘制时利用双缓冲技术，先创建一个和显示文字串一样大小的缓冲区，将文字绘制在缓冲区，再利用图像绘制方法绘制在Applet画面上。 -In the Applet screen with large characters drawn in red　Welcome　4 characters from left to them by the mobile, mobile to the right again to the left. However, rendering the use of double buffering technology, first create a text string and display the same as the size of the buffer zone, the text drawn in the buffer zone, and then use image drawing method in the Applet screen rendering.