Thread: I need help explaining an OutofBounds error for a String grid I made?

As my username suggests I need help with a lot of things. This grid I made is one of them. I get the following error message when I run the code below:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at gridArray.main(gridArray.java:12)
ex.:

 
class gridArray {
	 public static void main(String[]args){
	 //Creates a grid of integers
	 int [][] grid = new int [4][2];
	 int j,i;
	 int v = 2;
	 //Using i and j in a for loop This is going to create a grid with v as the constraint
	 for (i=0;i<grid.length;i++){
	 	for (j = 0; j < grid[i].length; j++);
	 	{
	 		grid[i][j] = v;
	 		System.out.print(grid[i][j] + " ");
	 		v--;
	 	}
	 	System.out.println("");
	 }
	 }
 }

Therefore I was wondering if there was anything blatantly obvious that I did wrong?

Yes, theres a ; behind the second for loop, i.e. it just increments j.
If you declare the indexes in the for loop you had gotten a compilation error:

 int [][] grid = new int [4][2];
	 // int j,i;
	 int v = 2;
	 //Using i and j in a for loop This is going to create a grid with v as the constraint
	 for (int i=0;i<grid.length;i++){
	 	for (int j = 0; j < grid[i].length; j++)//;
	 	{
	 		grid[i][j] = v;
	 		System.out.print(grid[i][j] + " ");
	 		v--;
	 	}
	 	System.out.println("");
	 }

Thanks for the help, I can't believe it was that simple!

You're welcome