Java - drawing geometric shapes with stars '*'

Hey,
need Java source codes to draw this geometric shapes (10 total, marked in the pictures) with for loops
https://imgur.com/a/1HKLwcO

width/height exactly as pictured

for example nr 28
##########################################################
package com.company;

public class Main {

public static void main(String[] args)
{
int n=8;
int a;
int b;

//oben
for (int i=0; i<=n; i++)
{
for (a=0; a<(n-i); a++)
{
System.out.print(" ");
}
for (b=0; b0; a--)
{
System.out.print(" ");
}
for (b=0; b<i; b++)
{
if(b==0 || b == i-1)
System.out.print("* ");
else
System.out.print(" ");
}

System.out.println();
}
}
}
##########################################################