java寻找迷宫路径

问题描述：
/*
* 用非递归的栈来解决
* 用类来解决迷宫路径的查找问题，寻找一条从左上角迷宫入口
* 到右下角迷宫出口的一条有效路径，0代表可以行走，1代表不能行走，
* 找到，请输入最终的迷宫和路径信息， 找不到，请输出不存在有效路径。
*
* 软件的运行如下：
*
* 请输入迷宫的行列数(m * n)：5 5
* 请输入迷宫的路径：
* 0 0 1 0 0
* 1 0 0 1 0
* 0 1 0 1 0
* 0 0 0 1 0
* 0 0 0 0 0
*
* 正在寻找迷宫路径。。。
*
* 从左上角入口到右下角出口不存在有效路径 、、、、
* 路径已找到，输入如下(2代表行走的路径)：
* 2 2 1 0 0
* 1 2 2 1 0
* 0 1 2 1 0
* 0 0 2 1 0
* 0 0 2 2 2
*
*
* */

package com.src.maze;

//抽象迷宫路径的每一个节点的类型
public class MazeNode {
    private int value;
    private int i;
    private int j;
    private int[] pathState;

    public MazeNode(int value, int i, int j){
        this.value = value;
        this.i = i;
        this.j = j;

        //初始化节点的四个方向的路径信息，都初始化成不能行走
        pathState = new int[Constant.WAY_NUMBER];
        for(int k=0; k//设置给节点的path方向状态为state
    public void setPathState(int path,int state){
        pathState[path] = state;
    }

    public int getPathState(int path){
        return pathState[path];
    }
    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }

    public int getRow() {
        return i;
    }

    public void setRow(int i) {
        this.i = i;
    }

    public int getCol() {
        return j;
    }

    public void setCol(int j) {
        this.j = j;
    }
}

package com.src.maze;

//主要定义这个项目中所用到的所有的常量
public class Constant {
    //表示方向的总数
    public static final int WAY_NUMBER = 4;

    //表示路径可以行走
    public static final int WAY_ENABLE = 1;

    //表示路径不可以行走
    public static final int WAY_DISABLE = 0;

    //表示迷宫节点四个方向
    public static final int WAY_EAST = 0;
    public static final int WAY_SOUTH = 1;
    public static final int WAY_WEST = 2;
    public static final int WAY_NORTH = 3;

}

package com.src.maze;

import java.util.Arrays;
import java.util.Scanner;

class SqStack{
    private MazeNode[] stack;
    private int top;

    public SqStack(){
        top = 0;
        stack = new MazeNode[50];
    }

    //push要支持stack的内存增长操作，一次性增长2倍
    public void push(MazeNode node){
        if(full()){
               this.resize();  
            }
            this.stack[top++] = node; 
    }
    public void pop(){
        if(empty())
            return ;
        this.top--;
        }
    public MazeNode top(){
        return this.stack[this.top-1];
    }
    public boolean full(){
            return this.top==this.stack.length;
            }
    public boolean empty(){
        return this.top == 0;
    }
    private void resize(){  
        this.stack = Arrays.copyOf(this.stack, this.stack.length*2);
        }
}


//迷宫类
class Maze{
    private int row;
    private int colum;
    private MazeNode[][] mazePath;
    private SqStack stack;

    public Maze(int row, int colum){

        this.row = row;
        this.colum = colum;
        mazePath = new MazeNode[this.row][this.colum];

        stack = new SqStack();
    }

    public void setPath(int i, int j, int value){
        mazePath[i][j] = new MazeNode(value, i, j);
    }

    //该函数主要用来更改迷宫节点四个方向的行走状态
    public void adjustMazePath(){
        for(int i=0;ifor(int j=0;jif(mazePath[i][j].getValue() == 0){
                    //东
                    if(j1 && mazePath[i][j+1].getValue() == 0 ){
                        mazePath[i][j].setPathState(Constant.WAY_EAST, Constant.WAY_ENABLE);
                    }
                    //南
                    if(i1 && mazePath[i+1][j].getValue() == 0 ){
                        mazePath[i][j].setPathState(Constant.WAY_SOUTH
                                , Constant.WAY_ENABLE);
                    }
                    //西
                    if(j>0 && mazePath[i][j-1].getValue() == 0 ){
                        mazePath[i][j].setPathState(Constant.WAY_WEST, Constant.WAY_ENABLE);
                    }
                    //北
                    if(i>0 && mazePath[i-1][j].getValue() == 0 ){
                        mazePath[i][j].setPathState(Constant.WAY_NORTH, Constant.WAY_ENABLE);
                    }
                }
            }
        }
    }

    //开始寻找迷宫路径
    public void findMazePath(){
        int i = 0;
        int j = 0;
        stack.push(mazePath[i][j]); 
        while(!stack.empty() ){
            //获得栈顶元素的行列号。
            i = stack.top().getRow();
            j = stack.top().getCol();
        if(i == row-1 && j == colum-1){
                break;
        }
        //东，判断当前节点东边可以走，将当前节点的东边改为不可走，将东边节点的西边改为不可走，再将东边节点入栈，再进行下一次的循环判断
        if(mazePath[i][j].getPathState(Constant.WAY_EAST) == Constant.WAY_ENABLE ){
                mazePath[i][j].setPathState(Constant.WAY_EAST ,Constant.WAY_DISABLE);
                mazePath[i][j+1].setPathState(Constant.WAY_WEST ,Constant.WAY_DISABLE);
                stack.push(mazePath[i][j+1]);
                continue;
        }
        //西
        if(mazePath[i][j].getPathState(Constant.WAY_WEST) == Constant.WAY_ENABLE){
                mazePath[i][j].setPathState(Constant.WAY_WEST ,Constant.WAY_DISABLE);   
                mazePath[i][j-1].setPathState(Constant.WAY_EAST ,Constant.WAY_DISABLE);
                stack.push(mazePath[i][j-1]);
                continue;
        }
         //南
        if(mazePath[i][j].getPathState(Constant.WAY_SOUTH) == Constant.WAY_ENABLE){
                mazePath[i][j].setPathState(Constant.WAY_SOUTH ,Constant.WAY_DISABLE);  
                mazePath[i+1][j].setPathState(Constant.WAY_NORTH ,Constant.WAY_DISABLE);
                stack.push(mazePath[i+1][j]);
                continue;   
        }
         //北
        if(mazePath[i][j].getPathState(Constant.WAY_NORTH) == Constant.WAY_ENABLE){
                mazePath[i][j].setPathState(Constant.WAY_NORTH ,Constant.WAY_DISABLE);  
                mazePath[i-1][j].setPathState(Constant.WAY_SOUTH ,Constant.WAY_DISABLE);
                stack.push(mazePath[i-1][j]);
                continue;
        }
            stack.pop();

        }   
        if(stack.empty()){
            System.out.println("无合适路径");
        }
}





    //打印最终的迷宫路径信息
    public void showMazePath(){
        //将栈内元素改为2,即迷宫路径    

        while(!stack.empty()){          
            int i = stack.top().getRow();
            int j = stack.top().getCol();
            stack.pop();
            this.setPath(i, j, 2 );
        }
        for(int i=0; ifor(int j=0; jout.print(this.mazePath[i][j].getValue()+" ");
            }
            System.out.println();
         }
    }
}

public class TestMazePathDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);

        System.out.print("请输入迷宫的行列数(m * n):");
        int row = scan.nextInt();
        int col = scan.nextInt();

        //maze现在代表的就是整个迷宫
        Maze maze = new Maze(row, col);

        System.out.println("请输入迷宫的路径：");
        for(int i=0; ifor(int j=0; jint data = scan.nextInt();
                maze.setPath(i, j, data);
            }
        }

        //以上代码，就把整个迷宫路径的信息都设置到maze对象里面了
        //该函数主要用来更改迷宫节点四个方向的行走状态
        maze.adjustMazePath();
        //开始寻找迷宫路径
        maze.findMazePath();
        //打印最终的迷宫路径信息
        maze.showMazePath();
    }

}