For a better idea of what's covered in the book, take a look at the Table of Contents (in PDF).

List of Answers to Questions and Exercises online:

1. Getting Started Answers

2. .Object-Oriented Programming Concepts Answers

3. Language Basics--Variables Answers

4. Language Basics--Operators Answers

5. Language Basics--Expressions, etc. Answers

6. Language Basics--Control Flow Statements

7. Object Basics and Simple Data Objects--Objects

8. Object Basics and Simple Data Objects--Characters and Strings

9. Object Basics and Simple Data Objects--Numbers

10. Object Basics and Simple Data Objects--Arrays

11. Classes and Inheritance--Creating Classes

12. Classes and Inheritance--Inheritance

13. Classes and Inheritance--Nested Classes

14. Interfaces and Packages--Creating Interfaces

15. Interfaces and Packages--Creating and Using Packages

16. Handling Errors with Exceptions Answers

17. Threads: Doing Two or More Tasks At Once Answers

18. I/O: Reading and Writing (but no 'rithmetic) Answers

19. User Interfaces that Swing Answers