Left padding a String with Zeros [duplicate]

Answer 1

The solution by Satish is very good among the expected answers. I wanted to make it more general by adding variable n to format string instead of 10 chars.

int maxDigits = 10;
String str = "129018";
String formatString = "%"+n+"s";
String str2 = String.format(formatString, str).replace(' ', '0');
System.out.println(str2);

This will work in most situations