begin-your-day-with-a-challenge-but-an-easy-one

Begin your day with a challenge, but an easy one.

There are no explanations. You have to create the code that gives the following results in Java:

oneTwoThree(0) == ['0', '0']
oneTwoThree(1) == ['1', '1']
oneTwoThree(3) == ['3', '111']
oneTwoThree(19) == ['991', '1111111111111111111']