like watch the program flow for example watch output after each cycle there are some techniques in turbo c I don't know what is called please help me

class star{
public static void main(String[] args) {
  int i, j;
        for(i=0; i<5; i++)
        {
            for(j=0; j<=i; j++)
            {
                System.out.print("* ");
            }
            System.out.println();
        }
      }
}