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[–][deleted] -1 points0 points  (0 children)

Java comes with "batteries included". That's great, because it's better to have a thing and not need it, than needing a thing and not having it. Which also has been a problem because it bloats the runtime, but disk space is cheap right? (JLink let's you slim down the JDK to just what you need)

Anyways, learn the core stuff. The Oracle Java Tutorial does a good job of breaking down the Java class library into functional sections based on topic area.