Move character through sequence

Question

Hi, I'm after abit of direction!
I have a character which sits in a sequence of numbers ('0' and '1') called in from a text file. The character needs to move through the '0's and get on to the other side. The program so far displays the character in amidst the grid of numbers in the DOS window but i'm not sure what I need to do next. How do I get this character 'name' to check whats next to it in order to make a move?
I just need to know what I need to do i.e. do I use an array or if statement? Do I need to specify something like North, East, South, West and get to do something like grid++ or something to check what comes next? Sorry this may sound a bit vague. I'll try and post the code if I can.
Thanks.

Answer 1

Hi,
I havn't got very far yet but heres the code for the 3 classes I have so far;
(Most of the maze class has already been written)
(Please excuse the comments!)
MAZE:
import java.io.*;
import java.util.*;
import EasyIO.*;
public class Maze {
* int number of rows
private int height;
* int number of columns
private int width;
* enter row for maze. NOTE start counting at 0
private int startRow;
* char 2D array to hold the representation of the maze.
* wall = '1'
* free = '0'
private char [][] grid;
* Maze constructor which gets all the data from a text file.
* File format:
* 1st line : height width startRow
* other lines : rows of maze
public Maze(String filename)
String line = "";
StringTokenizer tokenizer;
try
FileReader fr = new FileReader(filename);
BufferedReader br = new BufferedReader(fr);
line = br.readLine();
tokenizer = new StringTokenizer(line);
height = Integer.parseInt(tokenizer.nextToken());
width = Integer.parseInt(tokenizer.nextToken());
startRow = Integer.parseInt(tokenizer.nextToken());
grid = new char[height][width];
line = br.readLine();
int row = 0;
while (line != null && row < height)
for (int column = 0; column < line.length() && column < width; column++)
grid[row][column] = line.charAt(column);
row++;
line = br.readLine();
br.close();
catch (FileNotFoundException e)
System.out.println("The file "+filename+" was not found. The following error occurred: "+e);
EasyIn.pause("Press <Enter> to continue");
catch (IOException e)
System.out.println("The file "+filename+" could not be read. The following error occurred: "+e);
EasyIn.pause("Press <Enter> to continue");
catch (NumberFormatException e) {
System.out.println("Error in the first line of the file "+filename+": a number was expected.");
EasyIn.pause("Press <Enter> to continue");
public void showMaze()
for (int i=0;i<grid.length; i++)
for (int j=0; j<grid.length;j++)
System.out.print(grid[i][j]);
System.out.println();
public void getStartRobot()
grid[startRow][0]='R';
public char gridChar(int r, int c)
return grid[r][c];
ROBOT:
import EasyIO.*;
public class Robot
     //**Attributes**
private String r; //Enable user to enter name for robot
private char robot; //Take first letter of the name for robot to use in maze
     private int rowPosition; //Get position in row robot is currently in
     private int columnPosition; //Get position in column the robot is currently in
     //**Methods**
     public Robot();
     String r = new String();
System.out.println("Enter a name for your Robot:");
r = EasyIn.getString();
System.out.println("Hi " + r.toUpperCase());
EasyIn.pause("Press <Enter>");
System.out.println("You will now be known as " + r.charAt(0) + "!");
robot = r.charAt(0);
     EasyIn.pause("Press <Enter> to quit");
          getPosition();
          getNewPosition();
          //not sure about coding below?!
          Right=++
          Left = --
          if (wall=1)     //If wall =1 then turn right
                              //check if wall is 1 or 0 infront
          {                    //if 0 move forward, else turn right
               Right;
          else if (wall=0)
DRIVER:
import EasyIO.*;
// call in robot class
public class Driver
public static void main (String[]args)
System.out.println("Enter a maze name: ");
// String f ="Maze1.txt";
String f = EasyIn.getString();
System.out.println();
System.out.println("This is the maze - ");
Maze m = new Maze(f); //Code to display maze
m.showMaze();
m.getStartRobot();
System.out.println();
m.showMaze();
int r,c;
r=2;
c=1;
m.gridChar(r,c);
System.out.println("Character at grid position " + r + ", " + c + " is " + m.gridChar(r,c));
At the moment it reads in a text file which has the maze - the collection of 0 and 1. All it then does is display the maze. And then display again with an R in the first coloumn with first 0.
Its not reading anything from the Robot class at the moment? It needs to read from this text file file, follow the 0's through to the other side of the maze and out!
I really need to know What do I do next?!
Thanks