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hasCycle.java

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/**

* Definition for singly-linked list.

* class ListNode {

* int val;

* ListNode next;

* ListNode(int x) {

* val = x;

* next = null;

* }

* }

*/

public class Solution {

public boolean hasCycle(ListNode head) {

ListNode slow =head;

ListNode fast=head;

while(fast!=null &&fast.next!=null)

{

slow=slow.next;

fast=fast.next.next;

if(slow==fast)

return true;

}

return false;

}

}