A free YouTube playlist of short, incremental Java tutorials by John Purcell, covering basic and fundamental Java programming concepts. The videos are also offered as a free course on Udemy.

Commenters call the videos very simple and incremental, illustrating basic Java concepts clearly, and recommend them as a refresher or starting point for beginners.

On Reddit (2)

1. RecommendsBroughtToYouByMtDewr/learnprogramming2017in “which Java programing book is best for beginners?”

   Head First Java is one I recommend for complete beginners. Derek Banas and John Purcell also have some pretty good tutorials on Java, I recommend John Purcell's Cave of Programming lectures. Other than that you can check the wiki.

2. Recommendsbookinglyr/learnprogramming2016in “What are the best online Java courses to give me a broad understanding of a language for fifty dollars or less?”

   I don't know what your background is, if this is your first object-oriented language or what. I have gotten a better understanding of programming over the last couple of years, so I may not have the best recommendation, but to refresh on Java, I have found these videos from [Cave of Programming]…

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