java piramida

import java.util.Scanner;
public class piramida{
public static void main(String[] args){

int a,b;
System.out.println("Program Menampilkan Pola");
System.out.println("Masukkan n Pola yang Diinginkan: ");
Scanner pola = new Scanner (System.in);
int n = pola.nextInt();

for (a=1;a<=n;a++){
for (b=1;b<=n-a;b++)
System.out.print(" ");
for (b=1;b<2*a;b++)
System.out.print("*");

System.out.println("");}

for (a = 1; a <= n; a++) {
for (b = 1; b <= n; b++) {
System.out.print("");
for (b=1;b<2*n;b++){
System.out.print ("#");
}
System.out.printf("\n");
}
}
}
}