You made two mistakes when using rowPrimes
. See my annotations below:
public class Stars {
public static void main(String[] args) {
printMoreStars(Integer.parseInt(args[0]));
}
public static void printMoreStars(int n) {
int rowsPrime = 0;
for (int i = n + 1; i > 0; i--) {
for (int j = 0; j < (2 * i) - 1; j++) {
System.out.print(" ");
}
for (int d = 0; d < (2 * rowsPrime) - 1; d++) {
System.out.print("*" + " ");
}
System.out.println(); //new line character
rowsPrime += 1;
System.out.println(" ");
}
rowsPrime -= 2; // <- middle line is already printed, so skip that
//bottom triangle
for (int i = 1; i < n + 1; i++) {
for (int j = 0; j < (2 * i) + 1; j++) {
System.out.print(" ");
}
for (int d = 0; d < (2 * rowsPrime) - 1; d++) { // <- changed condition to be the same as above
System.out.print("*" + " ");
}
System.out.println(); //new line character
rowsPrime--; // <- you have to decrease rowPrime by one.
System.out.println(" ");
}
}
}