写一个Java程序把
https://www.bilibili.com/video/ ?p=21
p后面的值从1-500循环出来：输出结果是
https://www.bilibili.com/video/ ?p=1
https://www.bilibili.com/video/ ?p=2
https://www.bilibili.com/video/ ?p=3
https://www.bilibili.com/video/ ?p=4
https://www.bilibili.com/video/ ?p=5