Can we use String.format() to pad/prefix with a character with desired length?

Question

Can java.lang.String.format(String str, String str1) be used for adding prefix of a particular character.

I could do this for a number like:

Answer 1

This is how I solved this issue using the base jdks String.format function

String sendId="AABB";
int length=20;
String.format("%"+length+"s",sendId).replaceAll(" ","0")