用java实现一个数据结构！

import java.io.IOException;

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import java.util.Scanner;

public class LinkList {

private static Scanner san = new Scanner(System.in);

public static void main(String[] args) throws IOException {

List list = new List();

for (int i = 1; i = 10; i++) {

System.out.print("请输入第" + i + "个数: ");

list.add(san.nextInt());

list.print();

}

System.out.println("输入的数据如下: ");

list.print();

}

}

class node {

int data;

node next = this; // 指向自己

}

class List {

private node header = new node();

// 循环链表的尾部添加数据

public node add(int data) {

node current = new node();

node temp = header;

while (temp.next != header)

temp = temp.next;

current.data = data;

current.next = temp.next;

temp.next = current;

return current;

}

// 查询某个数字的位置 如果不在 返回-1；

public int search(int data) {

node temp = header;

int n = 0;

while (temp.next != header) {

temp = temp.next;

n++;

if (temp.data == data)

break;

}

if (temp.data == data)

return n;

else

return -1;

}

// 打印出整个链表

public void print() {

node temp = header;

while (temp.next != header) {

temp = temp.next;

System.out.print(temp.data + " ");

}

System.out.println();

}

// 插入数据

public node Insert(int pos, int data) {

node temp = header;

node current = new node();

for (int i = 0; i pos - 1; i++) {

if (temp.next != header) {

temp = temp.next;

} else

return null;

}

current.data = data;

if (temp.next != header) {

current.next = temp.next;

}

temp.next = current;

return current;

}

// 删除某个数据

public node del(int data) {

node temp = header;

node oldtemp = null;

node current = null;

while (temp.next != header) {

oldtemp = temp;

temp = temp.next;

if (temp.data == data) {

current = temp;

break;

}

}

if (current == header)

return null;

oldtemp.next = current.next;

return current;

}

}

求解释这段java代码,关于数据结构的

（1）sumAll()

意思是递归的求二叉树每个节点的值的和，比如只有一级的

1

2 3

这样对象1的左右对象就是2，3，通过sumAll求和，就是

int ans = this.i; // ans 实际等于1

if(left != null)

ans = ans + left.sumAll(); // ans = 1 + 2 = 3

if(right != null)

ans = ans + right.sumAll(); //ans = 3+ 3 = 6

如果有好几级的二叉树，也是依次类推，切记一定先从最底层开始推算，比如

1

2 3

2 1 3 5

1 2

（2）程序实际上是通过一个递归学习二叉树的遍历

（3） static int maxArray(int [] array)这个很简单就不说了哈~

(4) left前加下划线不是书写习惯，只是为了突出对象的左右节点，命名上并没有建议非要每个变量都这玩~ 当然，如果有特殊情节，也可以这么玩，随自己~

求程序代码（java版的数据结构）

3个class，运行UI.java。

******

public class CircuitException extends Exception {public CircuitException(){}}

*****

import java.util.LinkedList;

public class GPS {

public static final int MAX = 65535;

public GPS(int maxSize){

graph = new Graph(maxSize);

}

public GPS(){

graph = new Graph();

}

public Graph graph;

public static void main(String args[]){

GPS gps = new GPS();

try {

gps.graph.addEdge("a", "b", 1);

gps.graph.addEdge("a", "c", 1);

gps.graph.addEdge("b","d" , 1);

gps.graph.addEdge("c","d" , 1);

gps.graph.addEdge("d","e" , 1);

gps.graph.addEdge("d","f" , 1);

gps.graph.addEdge("e","t" , 2);

gps.graph.addEdge("f","t" , 1);

LinkedList list = gps.graph.getPath("a", "d");

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

System.out.print(list.get(i));

}System.out.println();

} catch (CircuitException e) {

System.out.println("出现了自环！");

}

gps.graph.showGraph();

System.out.println(gps.graph.gap);

}

public class Graph{

public int Zuidazhi = 50;

public int changdu = 0;

public Jiao[] vertex;

public double gap;

public Graph(){

vertex = new Jiao[Zuidazhi];

}

public Graph(int maxSize){

this.Zuidazhi = maxSize;

vertex = new Jiao[maxSize];

}

public void addVertex(String name){

vertex[changdu++] = new Jiao(name);

}

public void addEdge(String v1, String v2,double edge) throws CircuitException{

//先找到v1；

if(v1.equals(v2))

throw new CircuitException();

Jiao from = null;

Jiao to = null;

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

if(vertex[i].name.equals(v1)){

from = vertex[i];

}else if(vertex[i].name.equals(v2)){

to = vertex[i];

}

}

if(from == null){

this.addVertex(v1);

from = this.vertex[changdu-1];

}

if(to == null){

this.addVertex(v2);

to = this.vertex[changdu-1];

}//已经找到v1和v2；

//没有检测是否v1 v2边已经存在！

//加入边。

Jiao v1adj = new Jiao(v2);

v1adj.edge = edge;

Jiao v2adj = new Jiao(v1);

v2adj.edge = edge;

//添加联系

//检查联系是否已经存在

Jiao temp = from;

while(temp.next!=null){

Jiao temppar = temp;

temp = temp.next;

if(temp.name.equals(v1adj.name)){

temppar.next = temp.next;

}

}

v1adj.next = from.next;

from.next = v1adj;

//v2adj.next = to.next;

//to.next = v2adj;

}

//假设要找的必然存在，不用想是否不在

public LinkedList getPath(String v1 ,String v2){

int count = 0;

//System.out.println(count++);

boolean found[] = new boolean[changdu];

double distance[] = new double[changdu];

int to = 0;

Jiao from = null;

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

found[i] = false;

distance[i] = MAX;

}

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

if(vertex[i].name.equals(v1)){//找到始发地

from = vertex[i];

distance[i] = 0;

found[i] = true;

//System.out.println(count++);

}

if(vertex[i].name.equals(v2)){//找到目的地

to = i;

//System.out.println(count++);

}

}

//必须先准备好路径！

Jiao forCount = from;

int degree = 0;

while(forCount!=null){

degree++;

forCount=forCount.next;

}

LinkedList[] list = new LinkedList[degree];

int [] mark = new int[degree];

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

list[i]=new LinkedList();

mark[i]=MAX;

}

int test=0;

int count2 = 0;

int count3 = 0;

//System.out.println(count+++"xx");

while(!found[to]test++100){

//System.out.println(count+++"FIRST");

//开始时from到所有都是最大值。

//找到标记了的节点

//找标记了的节点邻接的未标记的节点。

//得到最短的边，并标记。

//更新现有路径

double min = MAX;

int address = -1;

int father = -1;

for(int i = 0 ; i changdu ; i++){//对于已经找到的顶点寻找最小的往后的距离。

if(found[i]){//找到了的。

Jiao temp = vertex[i];

while(temp!=null){//vertex的邻接顶点~~

//先看temp的号码~

int tempNumber = -1;

for(int j = 0 ; j changdu ; j++){

if(vertex[j].name.equals(temp.name)){

tempNumber = j;

break;

}

}

if(!found[tempNumber]){//如果是还没有找到的~

double dist = distance[i]+temp.edge;

if(dist min){

min = dist;

father = i;

//System.out.println(" "+min);

address = tempNumber;

}

}

temp = temp.next;

}

}

}found[address] = true;

distance[address] = min;

//添加到已有路径中去！

//知道father

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

if(list[i].isEmpty()||list[i].getLast().equals(vertex[father].name)){

list[i].addLast(vertex[address].name);

break;

}

}

}

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

if(list[i].isEmpty())

continue;

else{

if(list[i].getLast().equals(v2)){

gap=0;

//先求出gap

Jiao pre = from;

Jiao nex = null;

for(int j = 0 ; j list[i].size() ; j++){

for(int k = 0 ; k changdu ; k++){

if(vertex[k].name.equals(list[i].get(j))){

nex = vertex[k];break;

}

}

while(pre.next!=null){//找到下一个的长度

pre = pre.next;

//System.out.println(nex.name +"nex.name");

if(pre.name.equals(nex.name)){

gap+=pre.edge;

//System.out.println(" gap2 "+gap);

}

}

pre = nex;

}

//System.out.println(gap+"gap");

return list[i];

}

}

}

return null;

}

public void showGraph(){

Jiao temp;

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

temp = vertex[i];

while(temp!=null){

System.out.print(temp.name+temp.edge+" ");

temp = temp.next;

}System.out.println();

}System.out.println("Show Over!");

}

}

public class Jiao{

public String name;

public Jiao next = null;

public double edge;

public Jiao(String name){

this.name = name;

}

}

}

******

import java.awt.EventQueue;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.LinkedList;

import javax.swing.JButton;

import javax.swing.DefaultListModel;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JList;

import javax.swing.JOptionPane;

import javax.swing.JScrollPane;

import javax.swing.JSeparator;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

public class UI extends JFrame implements ActionListener{

private JTextField textField_5;

private JTextField textField_4;

private JList list_1;

private JList list;

private JTextField textField_1;

private JTextField textField_3;

private JTextField textField_2;

private JTextField textField;

private DefaultListModel model = new DefaultListModel();

private DefaultListModel model_1 = new DefaultListModel();

/**

* Launch the application

* @param args

*/

public static void main(String args[]) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

UI frame = new UI();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame

*/

public UI() {

super();

setTitle("GPS寻路");

getContentPane().setLayout(null);

setBounds(100, 100, 500, 375);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JScrollPane scrollPane = new JScrollPane();

scrollPane.setBounds(11, 36, 221, 193);

getContentPane().add(scrollPane);

list = new JList(model);

scrollPane.setViewportView(list);

final JScrollPane scrollPane_1 = new JScrollPane();

scrollPane_1.setBounds(253, 36, 218, 193);

getContentPane().add(scrollPane_1);

list_1 = new JList(model_1);

scrollPane_1.setViewportView(list_1);

final JLabel label = new JLabel();

label.setText("从");

label.setBounds(10, 249, 24, 18);

getContentPane().add(label);

final JLabel label_1 = new JLabel();

label_1.setText("到");

label_1.setBounds(11, 273, 24, 18);

getContentPane().add(label_1);

textField = new JTextField();

textField.setBounds(50, 247, 103, 22);

getContentPane().add(textField);

textField_2 = new JTextField();

textField_2.setBounds(50, 271, 103, 22);

getContentPane().add(textField_2);

final JLabel label_2 = new JLabel();

label_2.setText("距离");

label_2.setBounds(11, 297, 37, 18);

getContentPane().add(label_2);

textField_3 = new JTextField();

textField_3.setBounds(50, 295, 103, 22);

getContentPane().add(textField_3);

final JButton button = new JButton();

button.setText("添加");

button.setBounds(155, 250, 73, 28);

getContentPane().add(button);

final JButton button_1 = new JButton();

button_1.setText("删除");

button_1.setBounds(155, 285, 73, 28);

getContentPane().add(button_1);

final JLabel label_3 = new JLabel();

label_3.setText("距离：");

label_3.setBounds(253, 297, 39, 18);

getContentPane().add(label_3);

textField_1 = new JTextField();

textField_1.setBounds(293, 295, 86, 22);

getContentPane().add(textField_1);

final JButton button_2 = new JButton();

button_2.setText("显示路径");

button_2.setBounds(385, 249, 86, 68);

getContentPane().add(button_2);

final JLabel label_4 = new JLabel();

label_4.setText("路径表示");

label_4.setBounds(11, 10, 66, 18);

getContentPane().add(label_4);

final JLabel label_5 = new JLabel();

label_5.setText("最佳路径");

label_5.setBounds(253, 12, 66, 18);

getContentPane().add(label_5);

//

button.addActionListener(this);

button_1.addActionListener(this);

button_2.addActionListener(this);

final JLabel label_6 = new JLabel();

label_6.setText("从");

label_6.setBounds(253, 249, 24, 18);

getContentPane().add(label_6);

textField_4 = new JTextField();

textField_4.setBounds(293, 247, 86, 22);

getContentPane().add(textField_4);

final JLabel label_7 = new JLabel();

label_7.setText("到");

label_7.setBounds(253, 273, 24, 18);

getContentPane().add(label_7);

textField_5 = new JTextField();

textField_5.setBounds(293, 271, 86, 22);

getContentPane().add(textField_5);

final JSeparator separator = new JSeparator();

separator.setOrientation(SwingConstants.VERTICAL);

separator.setBounds(239, 10, 8, 317);

getContentPane().add(separator);

}

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if(e.getActionCommand().equals("添加")){

try{String from = textField.getText();

String to = textField_2.getText();

if(from.equals(to)){

JOptionPane.showMessageDialog(null, "始点与终点不能相同");

return;

}

if(from.equals("")||to.equals("")){

JOptionPane.showMessageDialog(null, "添加不能为空");

return;

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

if(model.get(i).toString().substring(0, model.get(i).toString().indexOf(":")).equals(

from+"-"+to))

model.remove(i);

}

double length = Double.parseDouble(textField_3.getText());

model.addElement(from+"-"+to+": "+length);

}catch(Exception e1){

JOptionPane.showMessageDialog(null, "距离为数字值");

}

}

if(e.getActionCommand().equals("删除")){

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

if(list.isSelectedIndex(i))

model.remove(i);

}

}

if(e.getActionCommand().equals("显示路径")){

try{

model_1.removeAllElements();

GPS gps = new GPS();

String full,from,to;

double length;

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

full = model.get(i).toString();

from = full.substring(0,full.indexOf("-"));

to = full.substring(full.indexOf("-")+2,full.lastIndexOf(":"));

length = Double.parseDouble(full.substring(full.indexOf(":")+1, full.length()-1));

//System.out.println(from);

//System.out.println(to);

try {

gps.graph.addEdge(from, to, length);

System.out.println(from +" "+ to);

} catch (CircuitException e1) {

System.out.println("有环存在");

}

}LinkedList list = gps.graph.getPath(textField_4.getText(), textField_5.getText());

model_1.addElement(textField_4.getText());

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

model_1.addElement(list.get(i));

}//计算路径长度

textField_1.setText(""+gps.graph.gap);

}catch(Exception e1){

JOptionPane.showMessageDialog(null, "没有找到有关节点");

}

}

}

}

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