RFR: 8357687: Remove unnecessary Map.containsKey from GraphicsEnvironment implementations

[Andrey Turbanov]

On Thu, 29 May 2025 22:21:12 GMT, Phil Race <prr at openjdk.org> wrote:

>it is one succinct line

But it's not one line - it's 2 lines
https://github.com/openjdk/jdk/blob/08b1fa4cb39e56497052e3ee13e679c8734cf7c5/src/java.desktop/macosx/classes/sun/awt/CGraphicsEnvironment.java#L174-L175

>there is nothing wrong with it

When I see `.containsKey` + `.get` instead of single `.get` - I always question: is this map can contain `null` values?
(Because it's the only reason why I can choose to have separate `.containsKey` call). So, it's always makes _reading_ code require a bit more brain activity, than it should be.
When we use `.get` + null check - it's more _obvious_ that we expect only non-null values.

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PR Comment: https://git.openjdk.org/jdk/pull/24907#issuecomment-2987027909