Java program to print hollow Pyramid with stars

Following program shows you how to print hollow pyramid with stars using for loop and while loop.

public class GFG{
     
    public static void main(String args[]) {
        int n = 6;
     
        printPattern(n);
    }
     
    static void printPattern(int n) {
        int i, j, k = 0;
        for (i = 1; i <= n; i++) // row=6
        {
            // Print spaces
            for (j = i; j < n; j++) {
                System.out.print(" ");
            }
            // Print #
            while (k != (2 * i - 1)) {
                if (k == 0 || k == 2 * i - 2)
                    System.out.print("*");
                else
                    System.out.print(" ");
                k++;
                ;
            }
            k = 0;
             
            // print next row
            System.out.println();
        }
        // print last row
        for (i = 0; i < 2 * n - 1; i++) {
            System.out.print("*");
        }
    }
}

Output:

 
     *
    * *
   *   *
  *     *
 *       *
*         *
***********

Try it online here https://onecompiler.com/java/3x5qwa794