I need a little help with my programming?

For my college Java programming class we've got to use a for loop to print out a pattern of numbers. I've done most of them but unfortunately I can't do the last two. The basic pattern looks like this:

public void displayPatternI(int lines) {

System.out.println("\n\tPattern I\n");

for (int i = 1; i <= lines; i++){

for (int j = 1; j <= i; j++)

System.out.print (j + " " );

System.out.println();

}

}

and it will print out:

1

12

123

1234

etc....

As I've said I've done most of the patterns required to make but I can't understand how to do the last two and the teacher and book are not helpful. I have to have them print out like this:

___1

__21

_321

4321

(I have to use underscores for spaces since Yahoo will just move them to the left if I don't)

etc...

and...

____1

___212

__32123

_4321234

543212345

etc....

I don't usually ask for help on this kind of thing but I don't understand it.