Function:是否是环链表，采用快慢指针，一个走的快些一个走的慢些 如果最终相遇了就说明是环 就相当于在一个环形跑道里跑步，速度不一样的最终一定会相遇。 @author crossoverJie Date: 04/01/2018 11:33 @since JDK 1.8
source not stored for this graph (policy: none)
nothing calls this directly
no outgoing calls
no test coverage detected