编写Applet(大小140*60)，其背景色为蓝色，画一个长方形（其填充色为pink，各边离边小于10像素）和一个在填充的长方形中左右移动的小球（半径15）-Write the Applet (size 140* 60), the background color is blue, draw a rectangle (the fill color pink, the side away from the edge of less than 10 pixels) and a filled rectangle move around a small ball (radius 15 )