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Thread: Problem in navigation in a txt file with specific direction

  1. #1
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    Default Problem in navigation in a txt file with specific direction

    I have a program that I am writing for class. It takes in the rooms of a txt file, creates an array for a dungeon. then I have to be able to navigate through the dungeon using n,s,e,w. When I entire north it is supposed to r--, south r++, e c++ and w --. The problem i am running into is that when I entire any of the directions, nsew, it only goes south. Here is the program
    I would like to put the file online but dont' know how.

    /*Wendy Nurton
     * wnurton
     * 5/5/2009
     * CS 160
     */
     
    import java.io.File;
    import java.util.Scanner;
    import java.util.StringTokenizer;
     
    public class Dungeon {
     
     
        public String rooms [][] = new String[6][4];
     
        public static void main(String[] args) throws Exception {
            Dungeon dun = new Dungeon();
            String dungeon = args[0]; 
            char direction = 'p';
            int row = 0;
            int col = 0;
            dun.printWelcomeMessage();
            dun.readRoomFile(dungeon);
            dun.printRoom(row, col);
            Scanner keyboard = new Scanner (System.in);
            direction = keyboard.next().charAt(0);
     
            do {
     
            switch (direction)
     
            {
     
            case 'h':
            case 'H':
                dun.printHelp();
                break;
            case 'n':
            case 'N':    
                if (dun.checkIsExitValid(row, col, "north"))
                    row --;
                else 
                    System.out.println("This is not a valid exit.");
                dun.printRoom(row, col);
                break;
            case 's':
            case 'S':
                if (dun.checkIsExitValid(row, col, "south"))
                    row++;
                else
                    System.out.println("This is not a valid exit.");
                dun.printRoom(row, col);
                break;
            case 'w':
            case 'W':
                if (dun.checkIsExitValid(row, col, "west"))
                    col++;
                else
                    System.out.println("This is not a valid exit.");
                break;
            case 'e':
            case 'E':
                if (dun.checkIsExitValid(row, col, "east"))
                    col--;
                else
                    System.out.println("This is not a valid exit.");
                break;
            case 'l':
            case 'L':
                dun.printRoom(row, col);
                break;
     
            }//if (dun.checkIfPit(row, col))
                //System.exit(0);
            }
            while (keyboard.next().charAt(0) != 'q');
     
     
        }
                   // TODO Auto-generated method stub
     
     
        public String[] args;
        public boolean checkIsExitValid(int x, int y, String dun) {
            // TODO Auto-generated method stub
    //        System.out.println(rooms[x][y]+";"+ dun);
            if (rooms[x][y].indexOf(dun)!=-1)
            return true;
            else 
                return false;
        }
        public boolean checkIfPit(int x, int y) {
            // TODO Auto-generated method stub
            return (checkIsExitValid(x, y, "pit"));
        }
        public String getRoomDescription(int row, int col) {
            // TODO Auto-generated method stub
     
            return (rooms[row][col]);
        }
     
        public void printRoom(int row, int col) {
            // TODO Auto-generated method stub
            System.out.println(rooms[row][col]);
        }
        public void printHelp() {
            // TODO Auto-generated method stub
     
            System.out.println("");
            System.out.println("Help: to play this game, you can move north, west, south or east."); 
            System.out.println("Type 'l' to take a look around at the room, or type 'q' to quit the game.");
        }
        public void printWelcomeMessage() {
            // TODO Auto-generated method stub
            System.out.println("Welcome to my dungeon!");
            System.out.println("We have creepy crawly monsters roaming about.");
            System.out.println("Find the escape route and win!");
            System.out.println("Or drop to your death in the deep pit.");
            System.out.println("Good luck!");
            System.out.println(" ");
            System.out.println("Menu options: 'h' for help, 'n' for north, 's' for south, 'w' for west, 'e' for east, 'l' to look around, and 'q' for quit.");
     
     
        }
     
        public void readRoomFile(String dungeon) throws Exception {
            File file = new File (dungeon);
            Scanner in = new Scanner(file);
     
            int i=0;
            while( in.hasNextLine())
            {
                StringTokenizer tokenizer = new StringTokenizer(in.nextLine(), ";\n");
     
                int x = Integer.parseInt(tokenizer.nextToken());
                int y = Integer.parseInt(tokenizer.nextToken());
     
     
                rooms [x][y] = (tokenizer.nextToken());
     
            }
     
     
            // TODO Auto-generated method stub
     
        }
     
    }
    Last edited by JavaPF; May 10th, 2009 at 08:53 AM. Reason: Please use code tags...


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: Moving through my array

    Hello wendybird79 and welcome to the Java Programming Forums

    I think you will find that this has already been solved here:

    http://www.javaprogrammingforums.com...e-problem.html

    Should make your life a lot easier!!

    import java.io.FileReader;
    import java.util.Scanner;
    import java.util.regex.Pattern;
     
    public class Dungeon {
        private String[][] dungeon = new String[6][4];
        public void printWelcomeMessage(){
            System.out.println("Welcome to my dungeon!");
            System.out.println("We have creepy crawly monsters roaming about.");
            System.out.println("Find the escape route and win!");
            System.out.println("Or drop to your death in the deep pit.");
            System.out.println("Good luck!");
            System.out.println();
            System.out.println("Menu options: 'h' for help, 'n' for north, 's' for south, 'w' for west, 'e' for east, 'l' to look around, and 'q' for quit.");
        }
        public void printHelp(){
            System.out.println("Help: to play this game, you can move north, west, south or east.");
            System.out.println("Type 'l' to take a look around at the room, or type 'q' to quit the game.");
        }
        public boolean readRoomFile(String file){
            Scanner fs;
            try{
                fs = new Scanner(new FileReader(file));
            }catch(Exception e){ return false; };
            for(String temp;fs.hasNextLine();){
                temp = fs.nextLine();
                dungeon[Integer.parseInt(temp.split(";")[0])][Integer.parseInt(temp.split(";")[1])] = temp.split(";")[2];
            }
            return true;
        }
        public void printRoom(int row, int col){
            System.out.println(dungeon[row][col]);
        }
        public String getRoomDescription(int row, int col){
            return dungeon[row][col];
        }
        public boolean checkIfPit(int row, int col){
            return Pattern.compile("[^a-zA-Z]pit[^a-zA-Z]").matcher(dungeon[row][col].toLowerCase()).find();
        }
        public boolean checkIsExitValid(int row, int col, char d){
            String direction = "";
            switch(d){
                case 's': direction = "south"; break;
                case 'w': direction = "west"; break;
                case 'n': direction = "north"; break;
                case 'e': direction = "east"; break;
                default: break;
            }
            if(direction != "")
                return Pattern.compile("[^a-zA-Z]"+direction+"[^a-zA-Z]").matcher(dungeon[row][col].toLowerCase()).find();
            return false;
        }
        public Dungeon(String filename){
            Scanner sin = new Scanner(System.in);
            String choice;
            Pattern goalp = Pattern.compile("[^a-zA-Z]goal[^a-zA-Z]");
            boolean goal = true;
            int roomx = 0, roomy = 0;
            do{
                if(goal){
                    while(!readRoomFile(filename)){
                        System.out.print("Please enter a valid file name: ");
                        filename = sin.next();
                    }
                    goal = false;
                    filename = "";
                    printWelcomeMessage();
                }
                System.out.print(">");
                choice = sin.next();
                if(choice.equals("h")) printHelp();
                else if(choice.equals("l")) printRoom(roomy, roomx);
                else if(choice.equals("n")||choice.equals("s")||choice.equals("e")||choice.equals("w")){
                    if(checkIsExitValid(roomy, roomx, choice.toLowerCase().charAt(0))){
                        switch(choice.charAt(0)){
                            case 'n': roomy -= 1; break;
                            case 's': roomy += 1; break;
                            case 'e': roomx += 1; break;
                            case 'w': roomx -= 1; break;
                            default: break;
                        }
                        printRoom(roomy, roomx);
                    }else{
                        System.out.print("There is no exit to the ");
                        switch(choice.charAt(0)){
                            case 'n': System.out.println("north."); break;
                            case 's': System.out.println("south."); break;
                            case 'e': System.out.println("east."); break;
                            case 'w': System.out.println("west."); break;
                        }
                    }
                }
                if(goalp.matcher(getRoomDescription(roomy, roomx).toLowerCase()).find() || checkIfPit(roomy, roomx) || choice.equals("q")){
                    goal = true;
                    System.out.println("Good Bye!");
                }
            }while(!choice.equals("q"));
        }
        public static void main(String[] args) {
            if(args.length > 0) new Dungeon(args[0]);
            else new Dungeon("");
        }
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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