Allow to extend NumberAxis

[Toni, Marc]

Hi All,

There is an open Enhancement issue (https://bugs.openjdk.org/browse/JDK-8090467), back from 2011, to allow extending from the NumberAxis class.

We (at Vector Germany) want to extend from NumberAxis to overwrite the implementations of "calculateTickValues" and "calculateMinorTickMarks" for better tick marks depending on the tick unit.
For testing purposes, we copied the implementation of NumberAxis and refactored the two methods. But due to licensing issues, we must not use this approach.

Is there any good reason not to remove the "final" modifier from the class definition? We would like to have this change ASAP.

Best regards,

Marc Toni
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