[ericsam]

where to learn java programming language professionally in London?

[Coursework.info]

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[Click Me]

Not technically in london, but more all over the world for this one - http://thenewboston.org/ - He does the best tutorials for so many programming languages.

[Oliver17]

Also thejavahub.net is an awesome resource. There are forums and also he has a YouTube channel. There are loads of tutorials for beginners and also on stuff like games programming.

Good luck