對于單鏈表不熟悉的可以看一下基于Java實現(xiàn)單鏈表的增刪改查

1、新建一個哨兵節(jié)點下一結(jié)點指向頭結(jié)點

2、把待反轉(zhuǎn)鏈表的下一節(jié)點插入到哨兵節(jié)點的下一節(jié)點

反轉(zhuǎn)之前的鏈表：1?>2?>3?>4>?>5

加入哨兵節(jié)點：dummp?>1?>2?>3?>4>?>5

原地反轉(zhuǎn)：

定義：prev=dummp.next; pcur=prev.next;

prev.next=pcur.next;

pcur.next=dummp.next;

dummp.next=pcur;

pcur=prev.next;

public Stu_node reverse_list(Stu_node head){if (head.next==null ||head.next.next==null) return null;Stu_node dump = new Stu_node(-1,' ');dump.next=head;Stu_node prev = dump.next;Stu_node pcur = prev.next;while(pcur!=null){ prev.next=pcur.next; pcur.next=dump.next; dump.next=pcur; pcur=prev.next;}return dump.next; }二、新建鏈表頭結(jié)點插法

二、新建鏈表頭結(jié)點插法：

新建一個頭結(jié)點，遍歷原鏈表，把每個節(jié)點用頭結(jié)點插入到新建鏈表中。最后，新建的鏈表就是反轉(zhuǎn)后的鏈表。

public Stu_node reverse_list1 (Stu_node head){//新建一個新的鏈表的頭結(jié)點Stu_node dump = new Stu_node(-1,' ');Stu_node pcur = head;//遍歷待反轉(zhuǎn)鏈表，頭結(jié)點插入到新的鏈表中while(pcur!=null){ Stu_node pnext = pcur.next; pcur.next = dump.next; dump.next=pcur; pcur=pnext;}//新鏈表頭結(jié)點不是需要返回的數(shù)據(jù)，因此返回頭結(jié)點的下一節(jié)點return dump.next; }三、利用棧結(jié)構(gòu)實現(xiàn)鏈表的反轉(zhuǎn)

由于棧結(jié)構(gòu)存儲數(shù)據(jù)是先進后出（后進先出）也可以通過棧達(dá)到反轉(zhuǎn)鏈表的目的。

public Stu_node reverse_stack(Stu_node head){Stack<Stu_node> stack = new Stack<>();Stu_node temp = head;//鏈表入棧while(temp!=null){ stack.push(temp); temp=temp.next;}//取出棧中的一個節(jié)點當(dāng)做新的鏈表的頭結(jié)點Stu_node new_head = stack.pop();Stu_node cur = new_head;//出站while(!stack.isEmpty()){ Stu_node node = stack.pop(); //將出站的節(jié)點指向取消 node.next=null; //將新的鏈表串起來 cur.next = node; cur = node;}return new_head; }四、完整代碼奉上

import java.util.Stack;public class revere_node { public static void main(String[] args) {LinkedNode list= new LinkedNode();Stu_node node1 = new Stu_node(1,'張三');Stu_node node2 = new Stu_node(2,'李四');Stu_node node3 = new Stu_node(3,'王二');Stu_node node4 = new Stu_node(4,'麻子');Stu_node node5 = new Stu_node(5,'趙六');//打印添加節(jié)點之前的鏈表list.print();//尾結(jié)點添加節(jié)點list.add(node1);list.add(node2);list.add(node3);list.add(node4);list.add(node5);//打印添加加點之后的鏈表list.print();System.out.println('-------------------');//定義一個頭結(jié)點接收調(diào)用函數(shù)返回的頭節(jié)點Stu_node head = list.reverse_stack(list.head);//遍歷輸出每個節(jié)點while (head.next!=null){ System.out.println(head); head=head.next;} }}//定義一個鏈表的操作類class LinkedNode{ //定義一個頭結(jié)點 Stu_node head = new Stu_node(-1,' '); //添加鏈表的方法 public void add(Stu_node node){Stu_node temp = head;while(true){ if (temp.next==null)break; temp=temp.next;}temp.next=node; } //打印鏈表 public void print(){Stu_node temp = head.next;if (head.next==null){ System.out.println('此鏈表為空');}while (temp!=null){ System.out.println(temp); temp=temp.next;} } //原地反轉(zhuǎn) public Stu_node reverse_list(Stu_node head){if (head.next==null ||head.next.next==null) return null;Stu_node dump = new Stu_node(-1,' ');dump.next=head;Stu_node prev = dump.next;Stu_node pcur = prev.next;while(pcur!=null){ prev.next=pcur.next; pcur.next=dump.next; dump.next=pcur; pcur=prev.next;}return dump.next; } //新建一個新的鏈表，頭結(jié)點插入法實現(xiàn)鏈表的反轉(zhuǎn) public Stu_node reverse_list1 (Stu_node head){Stu_node dump = new Stu_node(-1,' ');Stu_node pcur = head;while(pcur!=null){ Stu_node pnext = pcur.next; pcur.next = dump.next; dump.next=pcur; pcur=pnext;}return dump.next; } //利用棧實現(xiàn)反轉(zhuǎn)鏈表 public Stu_node reverse_stack(Stu_node head){Stack<Stu_node> stack = new Stack<>();Stu_node temp = head;//鏈表入棧while(temp!=null){ stack.push(temp); temp=temp.next;}//取出一個節(jié)點當(dāng)做新的鏈表的頭結(jié)點Stu_node new_head = stack.pop();Stu_node cur = new_head;//出站while(!stack.isEmpty()){ Stu_node node = stack.pop(); //將出站的節(jié)點指向取消 node.next=null; //將新的鏈表串起來 cur.next = node; cur = node;}return new_head; }}//節(jié)點類class Stu_node{ int num; String name; Stu_node next; //重寫toString方法，顯示節(jié)點數(shù)據(jù) @Override public String toString() {return 'Stu_node{' +'num=' + num +', name=’' + name + ’’’ +’}’; } public Stu_node(int num, String name) {this.num = num;this.name = name; }}總結(jié)

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