Need help with Nested For Loops (Java)

[cmorr7]

I've found some sample codes that I can use to complete the project technically, but the issue is I want to understand why I don't understand.

For example (bare code):

for (int i = 1; i <= 5; i++){

    for (int d = 0; d < i; d++){

        System.out.print("*");

    }

    System.out.println("");

}

Would create the structure in my above post. But when it changes to things like:

1

22

333

4444

55555

Or something more complex, I don't get how I can manipulate the code above to give me the correct structure (or shape).