On Thu, 18 Jul 2024 11:32:47 GMT, Shaojin Wen <d...@openjdk.org> wrote:
> class LocalTime {
> public String toString() {
> // ...
> if (nanoValue % 1000_000 == 0) {
> buf.append(Integer.toString((nanoValue / 1000_000) +
> 1000).substring(1));
> } else if (nanoValue % 1000 == 0) {
> buf.append(Integer.toString((nanoValue / 1000) +
> 1000_000).substring(1));
> } else {
> buf.append(Integer.toString((nanoValue) +
> 1000_000_000).substring(1));
> }
> // ...
> }
> }
>
> Currently, LocalTime.toString handles nanos by adding a value and then
> subString(1) to fill it with zeros. Using StringBuilder.repeat is more
> concise and has better performance.
Looking at #20229, can we create another utility method in jdk.internal like in
`DecimalDigits` to append to a StringBuilder a decimal output with a given
field width? Like
public static void printFixedWidth(StringBuilder sb, int width, int value) {
var size = JLA.stringSize(value);
sb.repeat('0', width - size);
sb.append(value);
}
And call this in `LocalTime` `LocalDate` `Formatter` etc.
-------------
PR Comment: https://git.openjdk.org/jdk/pull/20232#issuecomment-2236463542
