public static void main(String[] args) {

		String[][] a = new String[][] {{"A","B","C","D"},{"E","F","G","H"},{"J","K","L","M"},{"N","O","P","Q"}};

		Ausgabe(a);
		Mirror(a);
		Ausgabe(a);

	}

	private static void Ausgabe(String[][] x) {
		for (int i = 0;i  < x.length; i++) {
			for (int j = 0; j < x.length; j++) {
				System.out.print(" " + x[i][j] + " ");
			}
			System.out.println();
		}
	}

	private static void Mirror(String[][] x) {
		int ymax = x.length - 1;
		String tmp;
		for (int i = 0; i < x.length; i++) {
			for (int j = 0; j < x.length; j++) {
				if (j > i) {
					tmp = x[i][j];
					x[i][j] = x[ymax - i][ymax - j];
					x[ymax - i][ymax - j] = tmp;
				}
			}
		}
	}