I think the video training from Safari Books Online or similar training video services are faster. It depends how best you learn though. In the US java engineers often get $100-200K in the high tech metros. Entry level is lower obviously. "Worth it" is relative to the other opportunities you have and what jobs are available in your area.
I never bought one but I had access to plenty of them during college. It is a lot of talking for almost no coding. I believe DOERS are the ones who really learn, so Pick a tutorial from the internet and start coding. Start small and don't try to do anything too complex if you don't have the skills yet, or you might give up before mastering any programming language.
Wow, they're two very different languages. But if I was starting out with them, I'd just read blogs and start to do small projects as others have said. Writing code is the best way to learn the language. You don't need to buy any books at this stage -- maybe later if you actually want to progress to intermediate and advanced stages.
If you go to the actual java(and Im guessing c++ too), you'll be able to find a lot of information as well as several downloads.
A lot of times, a programming languages primary site will provide tons of content extremely similar to the way it is displayed in college textbooks. Best part is most of it's free.
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