个人思路：

笨蛋做法，但是好用

代码如下

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode getIntersectionNode(ListNode headA, ListNode headB) {
        
       Set set = new HashSet();
       ListNode  temp = headA;
       while(temp != null) {
        set.add(temp);
        temp = temp.next;
       }

       temp = headB;
       while(temp != null) {
            if(set.contains(temp)){
                return temp;
            }
            temp = temp.next;

       }
        return null;

    }
}