I say reading textbooks is the best way, along with using videos to help hammer home concepts you've read with seeing it done. Videos just can't explain concepts like a 1000 page book can, plain and simple. But everyone learns different. No matter what way you learn, I suggest having pen and paper handy for taking notes opposed to trying to do it hands on right off the back. Watch one time, take notes, then watch it again and practice the concepts used. I have notebooks filled with notes, examples, and they're color coded using highlighters.
For example:
Definition term - orange
Definition - yellow
Headings - blue
Examples - pink

Really meticulous, but it helps when I flip through my pages months later, and I know exactly what is what, without having to scan through.

No one can really give you a definite way. This works for me, but it may not be for you.

Be determined. No point in starting if you're going to get bored half way through.

Look at video tutorials, books, online tutorials, any method which teaches you Java or any other language from the basics - But always be prepared to put in the time and effort, or you will never get results.

I recommend TheNewBoston, He helped me out with c++.

[ Register or Signin to view external links. ]

Depends on the person you are, if you easily loose interest, i recommend taking IRL classes instead of reading those boring, never ending books. Also Udemy is really good, i would say most of the courses there about java are worth it. just be careful and pick the best course and not the cheapest theres is. i remember seeing a free one on java a while ago.