本程序主要在于区分hashmap 与 hashset 的不同之处，在程序中简单明要的列举了hashmap与hashset的具体用法，以及如何修改hashmap的键值。-This procedure is to distinguish between hashmap with hashset, the difference between simple Ming to be in the program lists the specific hashmap with hashset of usage, as well as how to modify the hashmap keys.