Need Logic/Java Code for below pattern

I need to understand the logic for the attached Star pattern in the image.

I could not really understand how the Spacing logic for first row as well as the only 3 astericks in last row is acheived.

Appreciate if anyone can provide complete code of java (using FOR loops - to print spaces and astercisk for each row)

What have you tried so far? What output did it produce?

output for code below that i tried:
   *    *
 *   *  *   *
*       **       *

int n =3; for ( int i = 1; i <= n; i=i+2){    int sp = (n-i);                              //spaces    for (int j = 1; j <= sp; j++) {                  //printing spaces    System.out.print(" ");    }    for (int k=1 ; k<=2*i-1; k++){    if (k==1 || k==2*i-1 ){    System.out.print("*");                      //printing spaces or *    }    else{    System.out.print(" ");    }    }    for (int j = 1; j <= sp; j++) {    System.out.print(" ");    }    for (int k=1 ; k<=2*i-1; k++){    if (k==1 || k==2*i-1 ){    System.out.print("*");    }    else{    System.out.print(" ");    }    }    System.out.println("");    }

If you want to avoid all these nasty space-jugglings :

Form a variable s = String[rows][cols] with cols = 4 * rows - 3 and rows = say 10;
Fill the array with "   " (or " ".repeat(3));
initialise:
currentRow = rows - 1;
deltax = 1;
And then use one loop:
from col = 0 to cols;
   set s[currentRow][col] to " * ";
   test: if currentRow == 0 or currentRow == rows - 1 then deltax = -deltax;
   currentrow += deltax;

Finally print s.

and selby,

welcome to the Ranch!