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LC#141 check if cycle exists in given LinkedList

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	`1`	`+package LinkedList;`
	`2`	`+`
	`3`	`+public class LinkedListCycle141 {`
	`4`	`+`
	`5`	`+ public class ListNode {`
	`6`	`+ int val;`
	`7`	`+ ListNode next;`
	`8`	`+`
	`9`	`+ ListNode(int x) {`
	`10`	`+ val = x;`
	`11`	`+ next = null;`
	`12`	`+ }`
	`13`	`+ }`
	`14`	`+`
	`15`	`+ public boolean hasCycle(ListNode head) {`
	`16`	`+`
	`17`	`+ if (head == null \|\| head.next == null)`
	`18`	`+ return false;`
	`19`	`+`
	`20`	`+ ListNode slow = head;`
	`21`	`+ ListNode fast = head;`
	`22`	`+`
	`23`	`+ while (fast.next != null \|\| slow.next != null) {`
	`24`	`+ slow = slow.next;`
	`25`	`+ fast = fast.next.next;`
	`26`	`+`
	`27`	`+ if (slow == fast)`
	`28`	`+ return true;`
	`29`	`+`
	`30`	`+ if (fast == null)`
	`31`	`+ return false;`
	`32`	`+`
	`33`	`+ if (fast.next == null \|\| slow.next == null)`
	`34`	`+ return false;`
	`35`	`+ }`
	`36`	`+`
	`37`	`+ return false;`
	`38`	`+ }`
	`39`	`+`
	`40`	`+}`

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