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Commit 6c3bfa2

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PHP实现单链表插入
1 parent c74ed0f commit 6c3bfa2

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2 files changed

+154
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lines changed

2 files changed

+154
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‎single_linked_list/node.php

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<?php
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namespace SingleLinedList;
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/**
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* 链表的结点类
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*/
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class Node
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{
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/**
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* 节点中数据
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*
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* @var null
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*/
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private $data = null;
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/**
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* 后继指针
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*
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* @var null
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*/
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private $next = null;
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public function __construct($data, $next)
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{
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$this->data = $data;
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$this->next = $next;
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}
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/**
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* 获取节点数据
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*
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* @return void
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*/
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public function getData()
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{
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return $this->$data;
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}
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/**
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* 设置节点数据
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*
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* @param mixed $data
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* @return void
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*/
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public function setData($data)
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{
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if (empty($data)) throw new \Exception('数据不能为空');
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$this->$data = $data;
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}
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/**
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* 获取后续指针
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*
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* @return void
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*/
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public function getNext()
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{
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return $this->next;
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}
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/**
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* 设置后续指针
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*
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* @param Node $next
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* @return void
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*/
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public function setNext($next)
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{
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if (empty($next)) throw new \Exception('下个节点不能为空');
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$this->next = $next;
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}
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}
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‎single_linked_list/singleLinkedList.php

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<?php
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namespace SingleLinedList;
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require Node.php;
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/**
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* 实现单链表
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*/
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class SingleLinedList
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{
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/**
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* 哨兵节点 - 头结点
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*
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* @var [type]
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*/
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private $head = null;
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/**
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* 链表长度
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*/
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private $length;
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/**
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* 初始化单链表
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*
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* @param null $head 头结点
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*/
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public function __construct($head = null)
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{
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// 空链表中生成头结点
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if ($head == null) {
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$this->head = new Node();
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} else { // 已有结点生成单链表
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$this->head = $head;
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}
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$this->length = 0;
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}
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/**
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* 获取链表长度
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*
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* @return int
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*/
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public function getLength()
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{
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return $this->length;
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}
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/**
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* 插入数据 采用头插法 插入新数据
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*
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* @param mixed $data
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* @return Node
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*/
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public function insert($data)
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{
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return $this->insertDataAfter($this->head, $data);
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}
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/**
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* 在某个节点后插入新的节点
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*
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* @param Node $originNode 要插入节点
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* @param mixed $data 数据
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* @return Node
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*/
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public function insertDataAfter(Node $originNode, $data)
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{
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if (empty($originNode)) {
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return false;
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}
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$newNode = new Node();
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$newNode->setData($data);
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/*
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* 将新的节点的后续指针指向要插入的节点的后续指针, 避免指针丢失
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* 若先将 originNode->next = newNode newNode->next = originNode->next
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* 等同于 newNode->next = originNode->next = newNode 指向newNode
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*/
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$newNode->setNext($originNode->getNext());
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$originNode->setNext($newNode);
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$this->length++;
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return $newNode;
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}
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}

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