java,arrays,multidimensional-array , Java comparing 2D array to digit is giving exceptions

## Question:

Tag: java,arrays,multidimensional-array

I'm trying to compare a 2D array to a Digit, but its throwing an exception.

Code

``````import org.newdawn.slick.Color;

public class Main {

public static int[][] map = {{0, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{1, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{2, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{3, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{4, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{5, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{6, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1},
{7, 2, 1, 3, 4, 1, 1, 3, 4, 1, 3, 5, 1}};

public static void main(String args[]) {
int I = 0;
int II = 0;

for (int y = 0; y < 7; y++) {

for (int x = 0; x < 11; x++) {

if (map[x][y] == 0) {
g.setColor(Color.blue);
g.fillRect(I, II, 100, 100);
}
if (map[x][y] == 1) {
g.setColor(Color.orange);
g.fillRect(I, II, 100, 100);
}
if (map[x][y] == 2) {
g.setColor(Color.white);
g.fillRect(I, II, 100, 100);
}
if (map[x][y] == 3) {
g.setColor(Color.red);
g.fillRect(I, II, 100, 100);
}
if (map[x][y] == 4) {
g.setColor(Color.green);
g.fillRect(I, II, 100, 100);
}
if (map[x][y] == 5) {
g.setColor(Color.gray);
g.fillRect(I, II, 100, 100);
}
I = x * 100;
I = y * 100;
}
}
}
}
``````

The exception its throwing is `java.lang.ArrayIndexOutOfBoundsException: 8` This is for a bare bones tile map system, if you want to test this you need slick2D and need to put this in the render loop.

It is because you are trying to access to the row `8` and you only have the maximum of position `7`.

Remember that the index of rows and columns starts in the position 0 and ends in the length-1.

Also, you have to remember that the first position of the array, in your case, `x`, are the rows, and the `y` are the columns.

``````array[rows][columns]
``````

So you have to change the order of your variables in your loops. Like this:

``````for(int x = 0; x < map.length; x++){

for(int y = 0; y < map[x].length; y++){
``````

The rest of the code can be like you have above.

I expect it will be helpful for you!

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