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单链表翻转

方法一:通过三个指针来分别指向链表的当前节点、上一节点、下一节点

    分别为P1,P2,P3。

    上代码:

    

  static class Node{        int val;        Node next;    }    public static Node reverse(Node node){        if (node==null||node.next==null){            return null;        }        Node current,pnext,prev;        current=node.next;        pnext=current.next;        current.next=null;        while (pnext!=null){            prev=pnext.next;            pnext.next=current;            current=pnext;            pnext=prev;        }        node.next=current;        return node;    }

方法二:

static Node reverse2(Node node){        if (node==null||node.next==null){            return null;        }        Node current,pnext;        current=node.next;        while (current.next!=null){            pnext=current.next;            current.next=pnext.next;            pnext.next=node.next;            node.next=pnext;        }        return node;    }

 

单链表翻转