Loops - execise no 05 slide no 67

package class170629;

import java.util.Scanner;

public class LoopsEx05Slide67 {

    public static void main(String[] args) {
        // input: integer number.
        // output: triangle of asterisks

        // create a scanner
        Scanner s = new Scanner(System.in);

        // ask for input
        System.out.print("Enter an integer number: ");
        // get and save input value
        int n = s.nextInt();

        // close scanner
        s.close();

        // for each row
        for (int row = 1; row <= n; row += 1) {
            // print asterisks on the left
            for (int ast = 0; ast < row; ast += 1) {
                System.out.print("*");
            }
            // print spaces first
            for (int spc = 0; spc < 2 * (n - row); spc += 1) {
                System.out.print(" ");
            }
            // print asterisks on the right
            for (int ast = 0; ast < row; ast += 1) {
                System.out.print("*");
            }

            // end of the line
            System.out.println();
        }

        System.out.println();
        /*
         * second solution: using String format and printf
         */
        // for each row
        for (int row = 1; row <= n; row += 1) {
            // build string of asterisks
            String ast = String.format("%" + row + "s", " ").replace(" ", "*");
            // build string of spaces
            String spc = row == n ? "" : String.format("%" + 2 * (n - row)
                    + "s", " ");

            // print the row
            System.out.printf("%s%s%s\n", ast, spc, ast);
        }

    }
}