The reason you might want to create a circularly linked list is if you want the ability to go backward through a list but don’t want the extra overhead of creating a doubly linked list. You can move backward through a circularly linked list by moving forward through the end of the list to the node you are trying to reach.
英文原文是这样的:
个人认为此处中文翻译可能不太合适。
总之就是说循环链表最后一个节点的后继节点是第一个节点,从最后一个节点再往后移动,就到了第一个节点,可以重新遍历一次找到你要的节点的意思。
我自己的渣翻,改自谷歌翻译: