RFR: 8354791: Use Hashtable.putIfAbsent in CSS constructor

[Sergey Bylokhov]

On Tue, 12 Nov 2024 09:13:07 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> We can use Hashtable.putIfAbsent instead of pair `get`/`put` methods.
> It's faster and cleaner.

src/java.desktop/share/classes/javax/swing/text/html/CSS.java line 737:

> 735:                            valueMapper);
> 736:         Object generic = new CssValue();
> 737:         for (Attribute key : Attribute.allAttributes) {

It seems that the entire method references the Attribute class via the CSS prefix.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22032#discussion_r2065032068