Others have addressed your questions about Java & Ruby, so let me handle the job angle. If you are ever unsatisfied with your job or your self-development, by

Others have addressed your questions about Java & Ruby, so let me handle the job angle. If you are ever unsatisfied with your job or your self-development, by all means move on. Life is short, and everyone deserves fulfilling and rewarding work. This is my advice regardless of profession; although it applies double for you, as this is literally the best job market we have ever seen for good people with technical skills. That said, do not quit without having another job lined up if you only have a year or two of experience. Look around, read up on career searching, call some companies, figure out what you want, and then pursue it. Get a company interested in you and negotiate for the best possible offer. When you have an offer, give your two weeks notice.