2D Array Loop Boundary Error

What is the result of executing the following code?

public class MatrixError {
    public static void main(String[] args) {
        int[][] grid = { {1,2}, {3,4} };
        for (int i = 0; i < grid.length; i++) {
            for (int j = 0; j <= grid[i].length; j++) {
                System.out.print(grid[i][j] + " ");
            }
        }
    }
}