Java 9: The Good, The Bad, and Private Interface Methods

Java 9 was released a few weeks ago. Check the release notes, they include many interesting features. However, I think that not everything is as good as Oracle and Java adepts seem to picture it. I see three trends in the Java world, which are good, bad, and ugly, respectively. Let's start with the good one.

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The first trend is an obvious improvement of the platform that compiles Java, packages JARs, and runs the bytecode. It definite...