import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
*
* The maze is a 20 x 50 matrix represented by a 2-dimensional Entity array (The
* Entity Class is defined in the next paragraph). Walls in the maze are
* represented by ‘*’ and empty positions by blank spaces. The maze shall be
* read from a text file “Maze.txt” (The Maze.txt file is provided). A squirrel
* is able to move to empty spaces in the maze.
*
* @author
*/
public class Maze {

/**
* 1.Max_Maze_Row: This class variable is a constant variable that defines
* the maximum number of rows in the maze (it should be set to 20 rows).
*/
public static final int Max_Maze_Row = 20;

/**
* 2.Max Maze Column: This class variable is a constant variable that
* defines the maximum number of columns in the maze (it should be set to 50
* columns).
*/
public static final int Max_Maze_Column = 50;

/**
* 3.maze[][] : This class variable shall be defined as a 2-dimentional
* Entity array that contains the full maze and the entities.
*/
public static Entity[][] maze = new Entity[Max_Maze_Row][Max_Maze_Column];

/**
* constructor
*/
public Maze() {
   for (Entity[] entities : maze) {
         for (int i = 0; i < entities.length; i++) {
            entities[i] = null;
         }
   }
}

/**
* This method reads the file passed to the method (e.g. Maze.txt) and
* initializes the 2-dimentional array with the maze content provided in the
* file.
*
* @param filename
*/
public static void create(String filename) {
   try {
         Scanner scanner = new Scanner(new File(filename));

         int row = 0;
         // read each line of the input file
         while (scanner.hasNext() && row < Max_Maze_Row) {
            String line = scanner.nextLine();

            // move over each character of the line
            for (int column = 0; column < line.length()
                     && column < Max_Maze_Column; column++) {
               char symbol = line.charAt(column);
               // set up the wall if it is an asterisk
               if (symbol == '*') {
                     maze[row][column] = new Wall(row, column);
               }
            }
            row++;
         }
         scanner.close();
   } catch (FileNotFoundException ex) {
         Logger.getLogger(Maze.class.getName()).log(Level.SEVERE, null, ex);
   }
}

Activity: Polymorphism Page 1 of 5 Page 1 of 5 Goals: By the end...