Thread: Game of life counter not working

I'm running into an issue where my method that should count neighbors gets an array out of bounds error. I have tried a couple of things to fix it, but they've all failed. Any suggestions?

public static int neighbors(boolean[][] matrix, int row, int col) {
		int count = 0;
 
		if (matrix[row][col]) {
			count++;
		}
		if (matrix[row - 1][col]) {
			count++;
		}
		if (matrix[row + 1][col]) {
			count++;
		}
		if (matrix[row][col - 1]) {
			count++;
		}
		if (matrix[row][col + 1]) {
			count++;
		}
		if (matrix[row + 1][col + 1]) {
			count++;
		}
		if (matrix[row + -1][col - 1]) {
			count++;
		}
		if (matrix[row - 1][col + 1]) {
			count++;
		}
		if (matrix[row + 1][col - 1]) {
			count++;
		}
 
 
		return count;
 
	}

This is the error:
"Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8
at Life.neighbors(Life.java:51)
at Life.main(Life.java:29)"

The matrix is determined by the user input:
boolean[][] matrix = new boolean[userRows][userColumns];