How to pad string in Java?

0 votes
Is there some easy way to pad Strings in Java?

Seems like something that should be in some StringUtil-like API, but I can't find anything that does this.
Apr 30, 2018 in Java by developer_1
• 3,280 points
37 views

1 answer to this question.

0 votes
Padding to 10 characters:

String.format("%10s", "foo").replace(' ', '*');
String.format("%-10s", "bar").replace(' ', '*');
String.format("%10s", "longer than 10 chars").replace(' ', '*');

output:

  *******foo
  bar*******
  longer*than*10*chars

Display '*' for characters of password:

String password = "secret123";
String padded = String.format("%"+password.length()+"s", "").replace(' ', '*');

output has the same length as the password string:

  secret123
  *********
answered Apr 30, 2018 by Rishabh
• 3,540 points

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