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8336741: Optimize LocalTime.toString with StringBuilder.repeat

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Reviewed-by: liach, rriggs, naoto
This commit is contained in:
Shaojin Wen 2024-07-24 22:39:49 +00:00 • committed by Chen Liang
parent 24f67d0254
commit 0898ab7f74
3 changed files with 166 additions and 8 deletions
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22
src/java.base/share/classes/java/time/LocalTime.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2012, 2023, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -92,6 +92,8 @@ import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.util.Objects;
import jdk.internal.util.DecimalDigits;
/**
* A time without a time-zone in the ISO-8601 calendar system,
* such as {@code 10:15:30}.
@ -1640,13 +1642,19 @@ public final class LocalTime
buf.append(secondValue < 10 ? ":0" : ":").append(secondValue);
if (nanoValue > 0) {
buf.append('.');
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));
int zeros = 9 - DecimalDigits.stringSize(nanoValue);
if (zeros > 0) {
buf.repeat('0', zeros);
}
int digits;
if (nanoValue % 1_000_000 == 0) {
digits = nanoValue / 1_000_000;
} else if (nanoValue % 1000 == 0) {
digits = nanoValue / 1000;
} else {
digits = nanoValue;
}
buf.append(digits);
}
}
return buf.toString();