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javawhitespacespacetrimspaces

Adding whitespace in Java

There is a class trim() to remove white spaces, how about adding/padding?

Note: " " is not the solution.

Solution

  • I think you are talking about padding strings with spaces.

    One way to do this is with string format codes.

    For example, if you want to pad a string to a certain length with spaces, use something like this:

    String padded = String.format("%-20s", str);

    In a formatter, % introduces a format sequence. The - means that the string will be left-justified (spaces will be added at the end of the string). The 20 means the resulting string will be 20 characters long. The s is the character string format code, and ends the format sequence.