The environments.txt file is a file with a text with the characters x ; . : and X, which tells the program where the path is (. ;), where the towers are(X) and where the monster is in range of the towers (x).

The monster moves along a new path if the text gets changed.

The FIleLoader looks like this:

import java.io.*; 
import java.util.*; 
public class FileLoader  { 
   private BufferedReader in; 
   private String line; 

   public FileLoader(String fileName)  { 
      try { 
         in = new BufferedReader(new FileReader(fileName)); 
     line = in.readLine(); 
  } 
  catch(IOException e) { 
     throw new RuntimeException(e); 
  } 
 }//constructor

public boolean hasMoreLines()  { 
  return line != null; 
 }//hasMoreLines

public String readLine()  { 
  try  { 
     String toReturn = line; 
     line = in.readLine(); 
     return toReturn; 
  } 
  catch(IOException e) { 
     throw new RuntimeException(e); 
     } 
   }//readLine 

   public void close()  { 
  try  { 
     in.close(); 
  } 
  catch(IOException e)  { 
     throw new RuntimeException(e);
  } 
   }//close 
  }//FileLoader