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Do you have more info on the cleanup in Java 9? Will they remove some deprecated methods then?



This talk has some good (and official) information: http://parleys.com/play/52549d02e4b0a43ac12124be

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How do deprecated methods affect you? Just curious. Maybe I'm missing something.

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In my opinion, they don't. If you use an IDE like Eclipse where deprecated methods are clearly marked by a strikethrough and marked with a compiler warning, I don't see the big deal. And the bonus is that old code still compiles with new versions (and there is something to be said for backwards compatibility, a la "This presentation is not compatible with Keynote" discussion from a few days ago)

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Methods are marked as deprecated when they're planned to be removed in the next version.

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That's the story that gets told, but how often have they actually removed something after deprecating it? Does anybody have a single concrete example of a method that actually went away?

http://stackoverflow.com/questions/18063599/has-ever-anythin...

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I don't believe they have ever removed a Class or method from the JDK... Thread still has all of those super-unsafe or non-implemented methods in it (see: stop(), destroy() etc.)

I think part of the reason for this ultra-conservative approach might be that alternate JVM implementations could in theory have well-implemented versions of deprecated methods such as the above-mentioned Thread ones.

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No, they (Sun) could not care less for alternate JVM implementations. The reason for that ultra-conservative approach was that they were hell bent on keeping compatibility.

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System.getenv was deprecated (in 1.1?), and then replaced with an implementation that threw UnsupportedOperationException (in 1.2?) because it was considered to be non-portable.

Later they saw sense and re-implemented it and un-deprecated it.

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