1. 1. Introduction
2. 2. Arithmetic and testing
3. 3. Lists, maps, and existing classes
4. 4. Object-oriented and Procedural programming
5. 5. Method dispatch
6. 6. A class design process
7. 7. Interfaces
8. 1. 7.1. Interfaces, part 2
   2. 7.2. Interfaces, part 3
9. 8. Abstract classes
10. 9. Inheritance and equality
11. 10. hashCode
12. 11. Comparables and Comparators
13. 1. 11.1. Comparables
    2. 11.2. Comparators
14. 12. Lambdas and functional interfaces
15. 13. Streams
18. Contributors