0466. Count Linked List Nodes

/**
 * Definition for ListNode
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */

public class Solution {
    /**
     * @param head: the first node of linked list.
     * @return: An integer
     */
    public int countNodes(ListNode head) {
        int count = 0;
        if(head != null){
            count++;
        }
        else{return count;}
        while(head.next != null){
            count++;
            head = head.next;
        }
        return count;
    }
}

100% test cases passedTotal runtime 2353 ms
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