public class Grille { public static void main(String[] args) { int size = Integer.parseInt(args[0]); for (int x = 0; x < size * 2 + 1; x++) { for (int y = 0; y < size; y++) { if (x % 2 == 0) System.out.print("+---"); else System.out.print("| "); } if (x % 2 == 0) System.out.println("+"); else System.out.println("|"); } } }