新手求助，这是我找的Java邻接表的代码，第三行ArcNode next怎么理解，Java中不是没有指针吗？？？？？？

理解为一个ArcNode型的变量。其实java中任何一个非基本数据类型的变量名就相当于一个指针，只是一般不这么说罢了。

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关于数据结构邻接表的代码解释

这个函数用于删除图中一个顶点的，删除顶点时要同时删除所有与该顶点相关联的边。设要删除的顶点为u，它的某个邻接点为v，则要先删除边（u，v）和（v，u）。又假定与v关联的边只有（v，u），则程序在删除（v，u）时，s指向（v，u），t指向s的前驱，这时，t就为空，而s不为空了。

java中如何把图用邻接表表示出来

package my.graph;

import java.util.ArrayList;

import java.util.Iterator;

import my.queue.*;

import my.stack.StackX;

/**

* 邻接表表示

* @author xiayi

*

*/

public class Graph {

private int MAX_VERTS = 20;

private Vertex vertexList[];

private boolean is = false;//是否为有向图

private int nVerts = 0;

private StackX stackX;

private Vertex dfs[];

private Vertex bfs[];

private Queue queue;

public Graph(){

vertexList = new Vertex[MAX_VERTS];

dfs = new Vertex[MAX_VERTS];

bfs = new Vertex[MAX_VERTS];

}

public Graph(int n){

vertexList = new Vertex[n];

dfs = new Vertex[n];

bfs = new Vertex[n];

}

public Graph(int n, boolean is){

this.is = is;

vertexList = new Vertex[n];

dfs = new Vertex[n];

bfs = new Vertex[n];

}

//////////////////////////////////////////////

public boolean isIs() {

return is;

}

public void setIs(boolean is) {

this.is = is;

}

public Vertex[] getVertexList() {

return vertexList;

}

public Vertex[] getDfs() {

return dfs;

}

public Vertex[] getBfs() {

return bfs;

}

////////////////////////////////////////////////////

/**

* 添加顶点

*/

public void addVertex(Vertex vertex){

vertex.setIndex(nVerts);

vertexList[nVerts] = vertex;

nVerts++;

}

/**

* 添加边

*/

public void addEdge(int start, int end){

vertexList.addAdj(vertexList);

if (!is) {vertexList.addAdj(vertexList);}

}

/**

* 返回节点个数

* @return

*/

public int getVertsCount(){

return vertexList.length;

}

/**

* 深度优先迭代器

* @return

*/

public Iterator dfsIterator(){

dfs();

return new DfsIterator();

}

/**

* 广度优先迭代器

* @return

*/

public Iterator bfsIterator(){

bfs();

return new BfsIterator();

}

////////////////////////////////////////////////////////

public void displayGraph(){

ArrayListVertex next = null;

for (int i = 0; i vertexList.length; i++) {

printVertx(vertexList[i]);

}

}

public void printVertx(Vertex vertex){

ArrayListVertex next = vertex.getAdj();

if(next == null){ System.out.println(vertex.toString()+" 无连接点");}

else{

System.out.print(vertex.toString()+"有邻接点:");

for (int i = 0; i next.size(); i++) {

System.out.print("顶点"+next.get(i).label+", ");

}

System.out.println();

}

}

///////////////////////////////////////////////////////////

public void dfs(){

stackX = new StackX(MAX_VERTS);

vertexList[0].isVisted = true;

dfs[0] = vertexList[0];

stackX.push(vertexList[0]);

int dfsIndex = 0;

Vertex vertex;

while(!stackX.isEmpty()){

vertex = getAdjVertex((Vertex)stackX.peek());

if(vertex == null){

stackX.pop();

}else{

vertex.isVisted = true;

dfs[++dfsIndex]=vertex;

stackX.push(vertex);

}

}

for (int i = 0; i getVertsCount(); i++) {

vertexList[i].isVisted = false;

}

}

public void bfs() {

queue = new Queue(MAX_VERTS);

vertexList[0].isVisted = true;

bfs[0] = vertexList[0];

queue.insert(vertexList[0]);

int bfsIndex = 0;

Vertex vertex;

while(!queue.isEmpty()){

Vertex vertex2 = (Vertex)queue.remove();

while((vertex = getAdjVertex(vertex2))!=null){

vertex.isVisted = true;

bfs[++bfsIndex] = vertex;

queue.insert(vertex);

}

}

for (int i = 0; i getVertsCount(); i++) {

vertexList[i].isVisted = false;

}

}

/**

* 得到一个邻接点

* @param vertex

* @return

*/

public Vertex getAdjVertex(Vertex vertex){

ArrayListVertex adjVertexs = vertex.getAdj();

for (int i = 0; i adjVertexs.size(); i++) {

if(!adjVertexs.get(i).isVisted){

return adjVertexs.get(i);

}

}

return null;

}

/////////////////////////////////////////////////////////////

private abstract class GraphIterator implements Iterator{

int count = 0;

public GraphIterator(){

}

public boolean hasNext() {

return count != getVertsCount()-1;

}

public Object next() {

// TODO Auto-generated method stub

return null;

}

public void remove() {

// TODO Auto-generated method stub

}

}

//深度优先迭代

private class DfsIterator extends GraphIterator{

public DfsIterator(){

super();

}

public Vertex next() {

return dfs[count++];

}

}

//广度优先迭代

private class BfsIterator extends GraphIterator{

public BfsIterator(){

super();

}

public Object next() {

return bfs[count++];

}

}

/////////////////////////////////////////////////////////

public static void main(String[] args) {

int nVerts = 10;

int c = 'A'-1;

Vertex vertex;

Graph myGraph = new Graph(nVerts, false);

for (int i = 0; i nVerts; i++) {

c++;

vertex = new Vertex((char)(c));

myGraph.addVertex(vertex);

}

myGraph.addEdge(0, 1);

myGraph.addEdge(0, 4);

myGraph.addEdge(1, 2);

myGraph.addEdge(2, 3);

myGraph.addEdge(4, 5);

myGraph.addEdge(4, 6);

myGraph.addEdge(5, 8);

myGraph.addEdge(6, 7);

myGraph.addEdge(7, 8);

myGraph.addEdge(8, 9);

System.out.println("深度优先迭代遍历：");

for (Iterator iterator = myGraph.dfsIterator(); iterator.hasNext();) {

vertex = (Vertex) iterator.next();

System.out.println(vertex.toString());

}

System.out.println("/n广度优先迭代遍历：");

for (Iterator iterator = myGraph.bfsIterator(); iterator.hasNext();) {

vertex = (Vertex) iterator.next();

System.out.println(vertex.toString());

}

}

}

class Vertex{

public char label;

public boolean isVisted;

public int index;

private ArrayListVertex next = null;

public Vertex(char lab) // constructor

{

label = lab;

isVisted = false;

}

//为节点添加邻接点

public void addAdj(Vertex ver){

if(next == null) next = new ArrayListVertex();

next.add(ver);

}

public ArrayListVertex getAdj(){

return next;

}

public void setIndex(int index){

this.index = index;

}

public String toString(){

return "顶点 "+label+",下标："+index+".";

}

}

代码来自：

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