archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-27 14:54:52 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8240094: Optimize empty substring handling

Browse source 
Reviewed-by: redestad, igerasim, jlaskey
This commit is contained in:
Sergei Tsypanov 2020-02-26 21:24:02 +01:00 • committed by Claes Redestad
parent 257de28b2c
commit f729514ebd
4 changed files with 23 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/java.base/share/classes/java/lang/String.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2020, 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
@ -1819,7 +1819,7 @@ public final class String
* @param src the characters being searched.
* @param srcCoder coder handles the mapping between bytes/chars
* @param srcCount count of the source string.
* @param tgt the characters being searched for.
* @param tgtStr the characters being searched for.
* @param fromIndex the index to begin searching from.
*/
static int lastIndexOf(byte[] src, byte srcCoder, int srcCount,
@ -1900,10 +1900,10 @@ public final class String
public String substring(int beginIndex, int endIndex) {
int length = length();
checkBoundsBeginEnd(beginIndex, endIndex, length);
int subLen = endIndex - beginIndex;
if (beginIndex == 0 && endIndex == length) {
return this;
}
int subLen = endIndex - beginIndex;
return isLatin1() ? StringLatin1.newString(value, beginIndex, subLen)
: StringUTF16.newString(value, beginIndex, subLen);
}