RFR: 8338937: Optimize the string concatenation of ClassDesc

[ExE Boss]

On Sun, 25 Aug 2024 13:36:34 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> Optimize ClassDesc related string concatenation, which will reduce object allocation during startup.

src/java.base/share/classes/java/lang/StringConcatHelper.java line 787:

> 785:     }
> 786: 
> 787:     static String concat(String prefix, String value, String suffix) {

`Class​::descriptorString()` can probably also make use of this method and `String​::concat​(String)`:

if (isArray()) {
	return "[".concat(componentType.descriptorString());
} else if (isHidden()) {
	// unchanged
} else {
	String name = getName().replace('.', '/');
	return StringConcatHelper.concat("L", name, ";");
}

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PR Review Comment: https://git.openjdk.org/jdk/pull/20705#discussion_r1730395340