System.out.printf("%"+(n)+"s \n")

public class Staircase {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		String str = "#";
		for (int i = 0; i < n; i++) {
			System.out.printf("%" + (n) + "s \n", str);
			str += "#";
		}
		in.close();
	}
}

Source: kodnest.com

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