MapLoader.java

import java.io.*;
import java.util.*;

public class MapLoader {

    public static String [] load (String fileName, int mapIndex) {
        boolean flag;
        Scanner inputFile;
        String fileLine;
        List <String> linesList = new ArrayList <> ();

        flag = false;
        try {
            inputFile = new Scanner (new File (fileName));
            while (true) {
                if (!inputFile .hasNextLine ()) {
                    break;
                }
                fileLine = inputFile .nextLine ();
                if (isMapString (fileLine)) {
                    flag = true;
                    if (0 == mapIndex) {
                        linesList .add (fileLine);
                    }
                    continue;
                }
                if (flag) {
                    if (0 == mapIndex) {
                        break;
                    }
                    --mapIndex;
                    flag = false;
                }
            }
            inputFile .close ();
        } catch (IOException ex) {
            ex .printStackTrace ();
            return null;
        }

        if (!flag || 0 != mapIndex) {
            return null;
        }
        return linesList .toArray (new String [linesList .size ()]);
    }

    private static boolean isMapString (String arg) {
        int k, length;
        boolean flag = false;

        length = arg .length ();
        if (3 > length) {
            return false;
        }
        for (k = 0; length > k; ++k) {
            switch (arg .charAt (k)) {
            case '#':
                flag = true;
            case ' ':
            case '$':
            case '*':
            case '+':
            case '.':
            case '@':
                break;
            default:
                return false;
            }
        }
        return flag;
    }
}