面试题13：在o(1)时间删除链表节点

public void (ListNode head,ListNode deListNode){  
       if(deListNode == null || head == null){  
           return ;  
       }  
       if(head == deListNode){  
           head =null;  
       }  
       else{  
           if(deListNode.next == null){  
               ListNode pinitListNode = head;  
               while(pinitListNode.next.next != null){  
                   pinitListNode = pinitListNode.next;  
               }  
               pinitListNode.next = null;  
           }else{  
               deListNode.data = deListNode.next.data;  
               deListNode.next = deListNode.next.next;  
           }  
       }  
   }