How to left pad a string with zero in java

Question

I am not getting how to left pad a string with zero in java?

Answer 1

If your string contains numbers only, you can make it an integer and then do padding:

String.format("%010d", Integer.parseInt(mystr));

Answer 2

String paddedString = org.apache.commons.lang.StringUtils.leftPad("129018", 10, "0")

the second parameter is the desired output length

"0" is the padding char