On Mon, 1 Jul 2024 16:28:09 GMT, ExE Boss <d...@openjdk.org> wrote: >> j.u.Formatter supports args == null > > When `args == null` or `args.length == 0`, then the format string can still > contain `%%` or `%n`, and those will be formatted to `"%"` and > [`System.lineSeparator()`] respectively. > > [`System.lineSeparator()`]: > https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/lang/System.html#lineSeparator()
Yeah, if args is null or empty and there are format specifiers in the format string it should throw `IllegalFormatException`. To @liach ’s earlier comments, `String.format` likely needs more exhaustive unit tests covering various positive and negative test cases. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/19956#discussion_r1661553502
