ArrayIndexOutOfBounds

Programming Questions

jamesgree..

in Programming Questions • 7 months ago

Hey guys,

Working on a task i've been set involving using the buffered reader to read in text from a file. The file has the format as followed:

x ## ## ## ##

where x is a letter and ## is a number. This has several lines all of which are consistent. However upon running the code i've put together i'm recieving an arrayindexoutofbounds error.

Any help identifying what i've managed to cock up would be greatly appreciated!

String line;
BufferedReader reader;
int i = 0;
class brick{
int x,y,wid,hei;
String type;
}
void setup(){
background(#FFFFFF);
size(500,500);
rectMode(CORNERS);
brick item;
reader = createReader("breakout1.lvl");
do{
try{
line = reader.readLine();
String lap = line;
i++;
}
catch(IOException e){
e.printStackTrace();
line = null;
}
if(line!=null){
item = new brick();
String[] pieces = split(line, TAB);
item.type = (pieces[0]);
item.x = int(pieces[1]);
println(pieces[2]);
item.y = int(pieces[2]);
item.wid = int(pieces[3]);
item.hei = int(pieces[4]);
println(line);
}
}while(line!=null);
}

Replies(7)

Chrisir

Re: ArrayIndexOutOfBounds

7 months ago

does this

println(pieces[2]);

work?

In which line does he crash?

It is not good to use try catch while debugging.

You can not see the errors then.

Chrisir

Re: ArrayIndexOutOfBounds

7 months ago

maybe TAB doesn't work and you want "\t"
or one line has only 4 elements

why not have println(line); further up in your code so you can see which line makes him crash?

jamesgree..

The reader code was actually given to us for this task, to the extent that i believe we don't need to understand it fully. It prints all of the lines until the end of the text document (or .lvl document) but it still gives an error on the arrayindexoutofbounds:2 so i assume that means the pieces[3] ? But i don't exactly understand why!

Many thanks for replying:)

jamesgree..

Re: ArrayIndexOutOfBounds

7 months ago

Still no clue :| as i said it seems to be able to print all of the lines, and all of the lines have exactly five elements (including the letter at the beginning)

GoToLoop

Re: ArrayIndexOutOfBounds

7 months ago

gives an error on the arrayindexoutofbounds:2

I guess it means an index = 2 only is enough to get an outta bounds exception.
Perhaps it can only have 2 elements, that is, only indices 0 & 1 are valid!

Use -> println( pieces.length ); to show how many items it has!

maybe TAB doesn't work and you want "\t"

Final field TAB has the same value as literal constant '\t':

println( hex(TAB) );
println( hex('\t') );

exit();

jamesgree..

Re: ArrayIndexOutOfBounds

7 months ago

Thanks for the reply,

Not sure what you mean by that, It can defiantely access the other information as I've use this same program to draw rectangles to the canvas, the issue being that i need to create a game using these rectangles, and unfortunately when it gives this nullpointerexception I can't interact with the canvas! But yeah when tested all of the values seem to function and draw all of the required squares.

EDIT: pieces.length is 5 throughout the lines until the last entry in which it is

SECONDEDIT: Omg, I feel like the biggest idiot ever! just checked the .lvl file and realised there was a line below the final line with no information on it, just a space or something, since removal i don't get the error. I'm so sorry for wasting you guys time!

Chrisir

Re: ArrayIndexOutOfBounds

7 months ago

Great you solved it!

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