4.Soal Keempat
Script :
import javax.swing.*;
public class tugas_bintang4 {
     public static void main (String[] args){
        int baris;
baris=Integer.valueOf(JOptionPane.showInputDialog("Masukan banyak bintang ?"));

        for (int i=1;i<=baris;i++){
            for (int j=1;j<=baris;j++){
                if(i<=j)
                System.out.print("*");
                else
                System.out.print(" ");
            }
            System.out.println();
        }
    }

}
Ountput :