3.Soal Ketiga
Script :
import javax.swing.*;
public class tugas_bintang3 {
    public static void main (String[] args){
        int baris,x,y;
baris=Integer.valueOf(JOptionPane.showInputDialog("Masukan banyak bintang ?"));
        x=baris+1;
        for (int i=1;i<=baris;i++){
            for (int j=1;j<=baris;j++){
                y=i+j;
                if(x<=y)
                System.out.print("*");
                else
                System.out.print(" ");
            }
            System.out.println();
        }
    }


}
Ountput :