perancangan berbasis objek

import java.util.Scanner;
public class pattern {
    public static void main(String args[])
    {
    int a;
    Scanner in = new Scanner(System.in);
    System.out.println("masukkan baris:");
    a = in.nextInt();
       for(int i=1;i<=a;i++)
       {
            for(int j=1;j<=i;j++)
            {
                 System.out.print("*");
            }
            System.out.println();
       }
    }
}