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[–] Acerebral 0 points 1 point (+1|-0) ago 

In addition to the excellent answers already here, you will often find yourself composing more complex data structures out of the basic ones you learned. How did that JSON blob get decoded? Why it's a List<Map<String, Object>> of course, where any of the Objects could be another Map, array, String, Boolean, or Long.

Being familiar with all of these structures can help you focus on the challenges surrounding the data contained therein rather than the structures themselves.

TLDR Listen to /u/brux