Tutorials:
The Complete Java Developer Course by Tim Buchalka on Udemy.
The Complete Ruby on Rails Developer Course by Mashrur Hossain and Rob Percival on Udemy.
Books:
OCA: Oracle Certified Associate Java SE 8 Programmer I Study Guide: Exam 1Z0-808 by Jeanne Boyarsky and Scott Selikoff
Head First Java, 2nd Edition by Kathy Sierra and Bert Bates