2d arrayist

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2d arrayist

 
-1
  #1
Nov 12th, 2008
what is wrong with this code. it does not read the input file correctly.

[/code]
private void readFile()
{
String fName = "c:\\game.txt";
ArrayList<ArrayList<String>> matrix = new ArrayList<ArrayList<String>>();
{
try
{
File file = new File(fName);
Scanner in = new Scanner(file);

// for ( int i = 0; i < matrix.size(); i++ )
// matrix.add(new ArrayList<String>());

while (in.hasNextLine())
{
String line = in.nextLine();

for (int i =0; i<matrix.size(); i++)
matrix.get(i).add(line);

}
in.close();
}
catch(Exception e)
{
String s = e.toString();
}
}
}

[/code]
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Re: 2d arrayist

 
0
  #2
Nov 12th, 2008
Doesn't this answer your question?
http://www.daniweb.com/forums/thread156720.html
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Re: 2d arrayist

 
0
  #3
Nov 12th, 2008
Your question has already been answered on your other thread, and I've explained twice the mistake you are making on the code tags. Again, it's this:


[code]
// paste code here
[/code]

not this:

[/code]
// paste code here
[/code]
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Re: 2d arrayist

 
0
  #4
Nov 12th, 2008
i tried the scanner thing and nothing.

Java Syntax (Toggle Plain Text) 
  1.   String fName = "c:\\game.txt";
  2.     ArrayList<ArrayList<String>> matrix = new ArrayList<ArrayList<String>>();
  3.  
  4.  
  5.  
  6.  
  7.     private void readFile()
  8.     {
  9.  
  10.         try         
  11.         {
  12.             File file = new File(fName);
  13.             Scanner in = new Scanner(new FileInputStream(fName)); 
  14.  
  15.  
  16.             while (in.hasNextLine())
  17.             {
  18.                 String line = in.nextLine();
  19.  
  20.                 for (int i =0; i<matrix.size(); i++)
  21.                     matrix.get(i).add(line);
  22.             }
  23.             in.close();
  24.         }
  25.         catch(Exception e)
  26.         {
  27.             String s = e.toString();
  28.         }
  29.  
  30.     }
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Re: 2d arrayist

 
0
  #5
Nov 12th, 2008
this is what im getting when i compile:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at Move.printFile(Move.java:87)
at Move.<init>(Move.java:40)
at Main.main(Main.java:19)
Java Result: 1
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Re: 2d arrayist

 
0
  #6
Nov 12th, 2008
line is getting a value, but for some reason matrix is not being populated. "i" always stays at 0. and there is info on the file it is reading from
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Re: 2d arrayist

 
1
  #7
Nov 12th, 2008
Mark your other thread solved please.

ArrayList<ArrayList<String>> matrix = new ArrayList<ArrayList<String>>();

Java Syntax (Toggle Plain Text) 
  1. matrix.get(i).add(line);

I don't see anywhere where you ever create an ArrayList of String and add it to matrix, so there's nothing to "get". You should create an ArrayList of String, add the Strings to it, then add that ArrayList to matrix. You are currently "getting" something that has never been added.

Java Syntax (Toggle Plain Text) 
  1. ArrayList <String> arraylist = new ArrayList<String> ();
  2. String line;
  3. // read a  line from file, store in line
  4. arraylist.add (line);
  5. matrix.add (arraylist);
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Re: 2d arrayist

 
0
  #8
Nov 12th, 2008
got it working now, but it is printing out the wrong thing.

Java Syntax (Toggle Plain Text) 
  1. private void printFile()
  2.     {
  3.  
  4.         for(int i=0; i<matrix.size(); i++)
  5.         {
  6.             System.out.println(matrix.get(i));
  7.         }
  8.     }

it is supposed to print

X XXXXX X
XXXXXXXXX
XXX X X X
X X X X X
XXXXXXXXX
XXXXXXXXX
XXXXXXXXX
XXXXXXXXX

it prints
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
[XXXXXXXXX, XXX X X X , XXX X X X , X X X X X, X X X X X, X X X X X, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX, XXXXXXXXX]
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Re: 2d arrayist

 
0
  #9
Nov 12th, 2008
Because that is the toString() representation of an ArrayList, which is what you are printing.

If you want to show it differently then iterate each list and print it as you see fit.
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