What does it mean when the program says "ArrayIndexOutofBoundsException"

ayla12345

i changed a couple of numbers in my sketch and now it just says "ArrayIndexOutofBoundsException" followed by the numner 2 or 3, the line its saying is out of bounds is void setFlag(){ for (int i=0;i<4;i++){ for (int j=0;j<4;j++){ flag[i][j]=60;

i know that this isn't that helpful if you don't know the entire code but i just don't know what numbers to change

KevinWorkman

It means that you're trying to access an array using an index that the array doesn't have.

Consider an array with three indexes:

int[] array = new int[3];

The array has three indexes: index 0, index 1, and index 2. So you can do any of this:

println(array[0]);
println(array[1]);
println(array[2]);

But you can't do this:

println(array[3]);

Or this:

println(array[167]);

The array only has 3 indexes (0, 1, and 2) so if you try to use an index other than those, you'll get an ArrayIndexOutOfBoundsException.

In your case, either i or j is not a valid index.

GoToLoop

https://Processing.org/reference/arrayaccess.html

http://docs.Oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

https://forum.Processing.org/two/discussion/8070/why-do-i-get-an-arrayindexoutofboundsexception