SegitigaBintang.java

import java.util.Scanner;

public class SegitigaBintang {

  public static void main(String[] args) {
    System.out.print("Mau berapa bintang? ");
    Scanner scanner = new Scanner(System.in);
    int bintang = scanner.nextInt();

    // int bintang = 5;

    for (int i = bintang; i > 0; i--) {
      for (int j = bintang - i; j >= 0; j--) {
        System.out.print(" ");
      }
      for (int j = 0; j < i; j++) {
        if (i == bintang)
          System.out.print("*");
        else {
          if (j == 0)
            System.out.print("*");
          else
            System.out.print(" ");
        }
      }
      for (int j = 0; j < i - 1; j++) {
        if (i == bintang)
          System.out.print("*");
        else {
          if (j == i - 2)
            System.out.print("*");
          else
            System.out.print(" ");
        }
      }
      System.out.println("");
    }
  }

}

Segitiga Bintang Menjungkir