package sudoku; public class Coordinate { private int x; private int y; public Coordinate(int row, int col) { this.x = row; this.y = col; } public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } public int calculateIndex(int size) { return this.y * size + this.x; } }