Currently it's O(n) - we do `n` shifts of bytes within `StringBuilder`. This can be reduced to O(1) improving the code like:
DateTimeFormatter dtf = new DateTimeFormatterBuilder() .appendLiteral("Date:") .padNext(20, ' ') .append(DateTimeFormatter.ISO_DATE) .toFormatter(); String text = dtf.format(LocalDateTime.now()); ------------- Commit messages: - Improve padding of DateTimeFormatter Changes: https://git.openjdk.org/jdk/pull/12131/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12131&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8300818 Stats: 5 lines in 1 file changed: 0 ins; 2 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/12131.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12131/head:pull/12131 PR: https://git.openjdk.org/jdk/pull/12131