(Kotlin is now officially recognized by Google as the first-class development language of Android. It is 100% interoperable with Java and has many new features that Java does not yet support. Every Android programmer must take the kotlin course, and every java programmer needs to know kotlin. Master that kotlin can develop web front-end, web back-end, Android mobile terminal, server script, desktop games, etc., explain with real cases, and refuse to talk on paper.)
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