206. 反转链表 Java版

class Solution {
    public ListNode reverseList(ListNode head) {

        ListNode prev = null;
        ListNode curr = head;
        ListNode nextTemp = null;

        while(curr != null){
            
            nextTemp = curr.next;
            curr.next=prev;
            prev = curr;
            curr = nextTemp;
        }

        return prev;
    }
}