随机画几栋大楼随机在大楼上出现随机的窗户，楼是黑色，灯是黄色，这是老师布置一个作业，让我们学会用Applet制作间的图案-Several buildings were painted on the building were in the building there were windows, floor is black, light yellow, it is the teacher arranged a job, let us learn to use the Applet produc