public  class Buchstabenpyramide {
	public  static void main(String[] args) {
		if(args.length != 1) {
			System.out.println("Please choose a letter!");
			System.exit(0);
		}
		char dest = args[0].charAt(0);
		char[] letters = {'A','B','C','D','E','F','G','H','I','J','K','L',
							'M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','['};
		int pointer = 0;
		int i = 0;
		recurse(dest,letters, i);
	}
	
	private static void recurse(char dest, char[] letters, int i) {
		if(letters[i] == dest+1) return;
		int pointer = 0;
		spaces(dest,i,0);
		single(pointer,letters[i],letters,i);
		System.out.println();
		recurse(dest,letters, i+1);
	}
	
	private static void spaces(char dest, int i, int j) {
		if(j == dest-65-i) return;
		System.out.print(" ");
		j++;
		spaces(dest,i,j);
	}
	
	private static void single(int pointer, char dest, char[] letters, int i) {
		if(pointer >= letters.length || pointer < 0) return;
		if(letters[pointer] == dest) {
			System.out.print(letters[pointer]);
			return;
		}
		System.out.print(letters[pointer]);
		single(pointer+1,dest,letters,i);
		System.out.print(letters[pointer]);
		return;
	}
}

xxx@xxx:Buchstabenpyramide$ java Buchstabenpyramide J
         A
        ABA
       ABCBA
      ABCDCBA
     ABCDEDCBA
    ABCDEFEDCBA
   ABCDEFGFEDCBA
  ABCDEFGHGFEDCBA
 ABCDEFGHIHGFEDCBA
ABCDEFGHIJIHGFEDCBA