单链表逆序

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java
单链表逆序

单链表逆序 java 工作

实现一：

#include "stdafx.h" 
#include <iostream> 
using namespace std; 
template <typename T> 
struct MyNode 
{ 
T id; 
MyNode * next; 
MyNode(T _id) 
{ 
id = _id; 
next = NULL; 
} 
}; 
template <typename T> 
class MyList 
{ 
MyNode<T> * head; 
MyNode<T> * current; 
public: 
MyList() : head(NULL) {} 
void add(T value) 
{ 
MyNode<T>* node = new MyNode<T>(value); 
if(head == NULL) 
{ 
head = node; 
current = head; 
} 
else 
{ 
current->next = node; 
current = node; 
} 
} 
void showAll() 
{ 
MyNode<T> *go = head; 
while(go != NULL) 
{ 
cout<<go->id<<endl; 
go = go->next; 
} 
} 
void reverse() 
{ 
MyNode<T> *preNode = NULL; 
MyNode<T> *currentNode = head; 
MyNode<T> *nextNode = head->next; 
while(true) 
{ 
nextNode = currentNode->next; 
currentNode->next = preNode; 
preNode = currentNode; 
currentNode = nextNode; 
if(currentNode->next == NULL) 
{ 
head = currentNode; 
head->next = preNode; 
break; 
} 
} 
} 
}; 
int main(int argc, char * argv[]) 
{ 
MyList<int> *list = new MyList<int>(); 
list->add(123); 
list->add(456); 
list->add(789); 
list->showAll(); 
list->reverse(); 
cout<<"after reverse:"<<endl; 
list->showAll(); 
system("pause"); 
return 0; 
}

实现二：

#include<iostream> 
#include<conio.h> 
#include<list> 
using namespace std;

template<class T> 
struct Node{ 
T value; 
struct Node<T>* next; 
Node(const T& v):value(v),next(NULL){} 
~Node(){ 
delete next; 
next=NULL; 
cout<<"~Node()"<<endl; 
} 
};

template<class T,class N> 
class Iterator{ 
public: 
Iterator(T v=NULL):t(v){} 
T& operator++()const{ 
t=t->next; 
return t; 
} 
const N& operator*()const{ 
return t->value; 
} 
N&operator*(){ 
return t->value; 
} 
const T& getT()const{ 
return t; 
} 
Iterator& operator=(Iterator& other){ 
t=other.getT(); 
return *this; 
} 
const Iterator& operator=(Iterator& other)const{ 
t=other.getT(); 
return *this; 
} 
private: 
mutable T t; 
};

template<class T,class N> 
bool operator!=(Iterator<T,N> i1,Iterator<T,N> i2){ 
return i1.getT()!=i2.getT(); 
}

 
template<class T> 
class NList{ 
public: 
typedef Iterator<Node<T>*,T> iterator; 
typedef const Iterator<Node<T>*,T> const_iterator; 
NList(const T& value){ 
head=tail=new Node<T>(value); 
} 
void addNode(const T& value){ 
tail->next=new Node<T>(value); 
tail=tail->next; 
} 
iterator begin(){ 
return iterator(head); 
} 
iterator end(){ 
return iterator(tail->next); 
} 
void reverse(){ 
if(head==tail) 
return ; 
Node<T>* end=head,*begin=tail; 
Node<T>* p1=head,*p2,*p3; 
p2=p1->next; 
p1->next=NULL; 
while(p2!=tail){ 
p3=p2->next; 
p2->next=p1; 
p1=p2; 
p2=p3; 
} 
p2->next=p1; 
head=begin,tail=end; 
} 
~NList(){ 
delete head; 
head=NULL; 
tail=NULL; 
cout<<"~NList()"<<endl; 
} 
private: 
Node<T>* head; 
Node<T>* tail; 
};

 
int main(){ 
NList<int> nlist(1); 
nlist.addNode(2); 
nlist.addNode(3); 
NList<int>::const_iterator p=nlist.begin(),end=nlist.end(); 
for(p=nlist.begin();p!=end;++p) 
cout<<*p<<endl; 
nlist.reverse(); 
end=nlist.end(); 
for(p=nlist.begin();p!=end;++p) 
cout<<*p<<endl; 
getch(); 
return 0; 
}

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