java 走迷宫 maze

      import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Maze extends JLayeredPane{
     File mazeFile;
     MazePoint [][] mazePoint;
     WallOrRoad [][] wallOrRoad;
     PersonInMaze person;
     HandleMove handleMove; 
     File wallImage,roadImage;
     int distance=26,m=0,n=0;
     public Maze(){
         setLayout(null);
         wallImage=new File("wall.jpg");
         roadImage=new File("road.jpg");
         person=new PersonInMaze();
         handleMove=new HandleMove();
         handleMove.initSpendTime();
         person.addKeyListener(handleMove);
         setLayer(person,JLayeredPane.DRAG_LAYER);
     }
     public void setMazeFile(File f){
         mazeFile=f;
         char [][]a;
         RandomAccessFile in=null; 
         String lineWord=null;
         try{  in=new RandomAccessFile(mazeFile,"r");
               long length=in.length();
               long position=0;
               in.seek(position);
               while(position<length){
                  String str=in.readLine().trim();
                  if(str.length()>=n)
                     n=str.length();
                  position=in.getFilePointer();
                  m++;
               }
               a=new char[m][n];
               position=0;
               in.seek(position);
               m=0;
               while(position<length){
                  String str=in.readLine();
                  a[m]=str.toCharArray();
                  position=in.getFilePointer();
                  m++;
               }
               in.close();
               wallOrRoad=new WallOrRoad[m][n];
               for(int i=0;i<m;i++){
                  for(int j=0;j<n;j++){
                     wallOrRoad[i][j]=new WallOrRoad();
                     if(a[i][j]=='1'){
                       wallOrRoad[i][j].setIsWall(true);
                       wallOrRoad[i][j].setWallImage(wallImage);
                       wallOrRoad[i][j].repaint(); 
                     }
                     else if(a[i][j]=='0'){
                       wallOrRoad[i][j].setIsRoad(true);
                       wallOrRoad[i][j].setRoadImage(roadImage);
                       wallOrRoad[i][j].repaint(); 
                     }
                     else if(a[i][j]=='*'){
                       wallOrRoad[i][j].setIsEnter(true);
                       wallOrRoad[i][j].setIsRoad(true);
                       wallOrRoad[i][j].repaint();
                     }
                     else if(a[i][j]=='#'){
                       wallOrRoad[i][j].setIsOut(true);
                       wallOrRoad[i][j].setIsRoad(true);
                       wallOrRoad[i][j].repaint();
                     } 
                  }
               } 
               mazePoint=new MazePoint[m][n];
               int Hspace=distance,Vspace=distance;
               for(int i=0;i<m;i++){
                   for(int j=0;j<n;j++){
                      mazePoint[i][j]=new MazePoint(Hspace,Vspace);
                      Hspace=Hspace+distance;
                   }
                   Hspace=distance;
                   Vspace=Vspace+distance;
               } 
               for(int i=0;i<m;i++){
                  for(int j=0;j<n;j++){
                    add(wallOrRoad[i][j]);
                    wallOrRoad[i][j].setSize(distance,distance);
                    wallOrRoad[i][j].
                    setLocation(mazePoint[i][j].getX(),mazePoint[i][j].getY());
                    wallOrRoad[i][j].setAtMazePoint(mazePoint[i][j]);
                    mazePoint[i][j].setWallOrRoad(wallOrRoad[i][j]);
                    mazePoint[i][j].setIsWallOrRoad(true);
                    if(wallOrRoad[i][j].getIsEnter()){
                       person.setAtMazePoint(mazePoint[i][j]);
                       add(person); 
                       person.setSize(distance,distance);
                       person.
                       setLocation(mazePoint[i][j].getX(),mazePoint[i][j].getY());
                       person.requestFocus();
                       person.repaint();
                    } 
                  } 
               }
               handleMove.setMazePoint(mazePoint);
         }
         catch(IOException exp){
              JButton mess=new JButton("无效的迷宫文件");
              add(mess);
              mess.setBounds(30,30,100,100); 
              mess.setFont(new Font("宋体",Font.BOLD,30));
              System.out.println(exp+"mess");
         }
    }
    public void setWallImage(File f){
       wallImage=f;
       for(int i=0;i<m;i++){
           for(int j=0;j<n;j++){
             if(wallOrRoad[i][j].getIsWall())
               wallOrRoad[i][j].setWallImage(wallImage);
               wallOrRoad[i][j].repaint();  
           }
       } 
    }
 
    public void setRoadImage(File f){
       roadImage=f;
       for(int i=0;i<m;i++){
           for(int j=0;j<n;j++){
             if(wallOrRoad[i][j].getIsRoad())
               wallOrRoad[i][j].setRoadImage(roadImage);
               wallOrRoad[i][j].repaint();  
           }
       } 
    }
    public HandleMove getHandleMove(){
         return handleMove;
    }
}