Method clear

java/Chapter 9/Question9_9/Question.java:48–52

(Integer[] columns)

	}
	
	public static void clear(Integer[] columns) {
		for (int i = 0; i < GRID_SIZE; i++) {
			columns[i] = -1;
		}
	}
	
	public static void printBoard(Integer[] columns) {
        drawLine();