Java-Gaming.org    
Featured games (81)
games approved by the League of Dukes
Games in Showcase (487)
Games in Android Showcase (112)
games submitted by our members
Games in WIP (553)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  numberFormatException  (Read 759 times)
0 Members and 1 Guest are viewing this topic.
Offline mc_java

Junior Newbie




Java games rock!


« Posted 2004-12-31 21:34:51 »

hi, does anybody know y im getting a numberFormatexception at : " int currentValue = Integer.parseInt(tokenizer.nextToken());"
with this code:

String mapValues[][] = new String[20][20];
           try
           {
                 FileReader mapFileReader = new FileReader("map.txt");
                 BufferedReader mapReader = new BufferedReader(mapFileReader);

                 for (int row = 0; row < 20; row++)
                 {
                       String line = mapReader.readLine();
                       StringTokenizer tokenizer = new StringTokenizer(line, " ");
                       for (int col = 0; col < 20; col++)
                       {
                             int currentValue = Integer.parseInt(tokenizer.nextToken());
                             mapValues[row][col] = line;
                       }
                 }
           }
           catch (IOException e){ System.out.println("Error: " + e); }

the number format in the files is like this:

11001
00100
11011
11010

thx in advance !
Offline woogley
« Reply #1 - Posted 2004-12-31 23:39:42 »

if there's no spaces between the numbers on the line, what's the point of StringTokenizer? It would be better to cycle through each number via String's charAt(int) method. I probably don't understand exactly what you're trying to do, but I would think this code would do the same (but actually work):
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
//String mapValues[][] = new String[20][20]; 
// you should note that your line's max length is 5, not 20!
String mapValues[][] = new String[5][20]; // 20 rows, 5 cols
try {
      int col,row;
      BufferedReader b = new BufferedReader(new InputStreamReader(new FileInputStream("map.txt")));
      String line;
      for (row = 0;row < mapValues.length;row++) {
            line = b.readLine();
            if (line == null) {
                  break;
            }
            for (col = 0;col < mapValues[row].length;col++) {
                  mapValues[row][col] = Integer.parseInt(""+line.charAt(col));
            }
      }
}  
catch (IOException e) {
      e.printStackTrace();
}

I didn't compile that so there might be a typo or something you'll need to fix Cheesy

I hope I somewhat understood what you wanted. Good luck!
Offline digitprop

Junior Member





« Reply #2 - Posted 2005-01-03 09:05:58 »

Well, this definitely looks like the input you are reading from the file is not what you expect it to be. Although woogley is definitely right in that the StringTokenizer would not work if there are no spaces in the input, I still don't understand why there is a NumberFormatException.

Instead I would expect the StringTokenizer to throw a NoSuchElementException.

I would suggest to a) print the stack trace (use e.printStackTrace() instead of println()), b) also catch other exceptions than just IOExceptions, c) print the current token inside the inner loop, just to see what it is (make sure to enclose it in brackets or something, to see where spaces are, if any; there won't be any leading or trailing spaces with a space delimiter in the StringTokenizer, but this is useful if you use different delimiters).

M. Fischer . www.digitprop.com
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

TehJavaDev (17 views)
2014-08-28 18:26:30

CopyableCougar4 (26 views)
2014-08-22 19:31:30

atombrot (39 views)
2014-08-19 09:29:53

Tekkerue (36 views)
2014-08-16 06:45:27

Tekkerue (33 views)
2014-08-16 06:22:17

Tekkerue (21 views)
2014-08-16 06:20:21

Tekkerue (33 views)
2014-08-16 06:12:11

Rayexar (67 views)
2014-08-11 02:49:23

BurntPizza (45 views)
2014-08-09 21:09:32

BurntPizza (36 views)
2014-08-08 02:01:56
List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50

List of Learning Resources
by SilverTiger
2014-07-31 16:26:06

List of Learning Resources
by SilverTiger
2014-07-31 11:54:12

HotSpot Options
by dleskov
2014-07-08 01:59:08
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!