program to calculate product of each column in matrix

Write a java program to print following pattern

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

import java.util.Scanner;
public class StarPattern10 {

public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
System.out.println("Enter n value");
int n=sc.nextInt();
int sp=0, st=n;
for(int i=1;i<=n;i++) {
for(int j=1;j<=sp;j++)
System.out.print(" ");
for(int j=1;j<=st;j++)
System.out.print("*");
if (i<=n/2){
sp++;
st=st-2;
}
else {
sp--;
st=st+2;
}
System.out.println();

}
}

}