Variasi Bintang - 1

import javax.swing.*;

 public class bintang1 {

    public static void main(String[]args) {

int angka=Integer.valueOf(JOptionPane.showInputDialog("Masukkan Angka"));

        for(int i=1;i<=angka;i++) {

            for(int j=1;j<=i;j++) {

                System.out.print("*");

            }

            System.out.println();

        }

    }

 }

 

Hasilnya :

*

**

***

****

*****