Place contents of xml file to 2D array

Question

i have a xml file like
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map SYSTEM "map.dtd">
<map width="5" height="5" goal="6" name="Hallways of Dooom">
     <random-item type='lantern' amount='5' />
     <random-item type='health' amount='10' />
     <tile x="1" y="0" type="floor">
          <renderhint>floor:wood</renderhint>
     </tile>
     <tile x="0" y="1" type="wall" />
     <tile x="1" y="1" type="floor" startlocation="1" />
     <tile x="3" y="1" type="floor">
          <item type="treasure">Bar of Silver</item>
          <renderhint>floor:stone,blood</renderhint>
     </tile>
</map>i was asked to creat a 5*5 2D array from it. each tile represents a position on the point. If the type of tile is wall, it is represented by number 2; if it is floor, it is represented by number 1.
i have written my code as following:
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import java.io.*;
public class parsexml
    public void parseXML()
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
     factory.setValidating(true);
     factory.setIgnoringElementContentWhitespace(true);
     try {
         DocumentBuilder parser = factory.newDocumentBuilder();
         Document doc = parser.parse(new File("hallways.xml"));
         System.out.println("XML file parsed.");
         processTree(doc);
     } catch (ParserConfigurationException e) {
         e.printStackTrace();
     } catch (SAXException e) {
         e.printStackTrace();
     } catch (IOException e) {
         e.printStackTrace();
    public void processTree(Document doc)
     int column = 0;
     int row = 0;
     int hori = 0;
     int vert = 0;
     String Type = "";
     Node element = doc.getDocumentElement();
     NamedNodeMap attrs = element.getAttributes();
     for (int i = 0; i < attrs.getLength(); i++) {
         Node attr = attrs.item(i);
         String attrName = attr.getNodeName();
         if (attrName == "width") {
          column = Integer.parseInt(attr.getNodeValue());
         if (attrName == "height") {
          row = Integer.parseInt(attr.getNodeValue());
     int[][] map = new int[row][column];
     NodeList children = element.getChildNodes();
     for (int i = 0; i < children.getLength(); i++) {
         Node child = children.item(i);
         String nodeName = child.getNodeName();
         if (nodeName == "tile") {
          NamedNodeMap attributes = child.getAttributes();
          for (int a = 0; a < attributes.getLength(); a++) {
              Node attribute = attributes.item(a);
              String attributeName = attribute.getNodeName();
              if (attributeName == "x") {
               hori = Integer.parseInt(attribute.getNodeValue());
              if (attributeName == "y") {
               vert = Integer.parseInt(attribute.getNodeValue());
              if (attributeName == "type") {
               Type = attribute.getNodeValue();
         if (Type == "floor") {
          map[hori][vert] = 1;
         } else if (Type == "wall") {
          map[hori][vert] = 2;
     print(map);
    public void print(int[][] map)
     for (int r = 0; r < map.length; r++) {
         for (int c = 0; c < map[r].length; c++) {
          System.out.print(map[r][c]);
         System.out.println();
    public static void main(String[] args)
     parsexml xml = new parsexml();
     xml.parseXML();
}When i run the program, i found it doesn't fills the spcified position on the array. all I get is a 5*5 grid of 0s.
Can anyone tells me why? thank you in advance.

Answer 1

Unless someone is willing to put in the time to do your job for you, you'll have to debug it yourself. Put in some debugging statements. In their simplest form this is just a bunch of System.out.println("your message here") calls where you put in messages describing the current point of execution (like what method you just started or are about to finish) and the values of relevant data (such as method parameters, loop indices, whatever you feel is important).
Then run the program and see what it tells you.