Practical Coding in Java

Learn to write and validate your own code

Darren Kessner, PhD

(revised January 9, 2026)

Introduction
0. Hello, world!
1. Functions and Testing
2. Strings and Math
3. Loops and Algorithms
4. Classes and Objects
5. Arrays
6. ArrayList
- HelloArrayList
- Coding Exercises: ArrayList
7. Array Algorithms
8. Lists of objects
- Animals
- Coding Exercises: Lists of Objects
9. Inheritance and Interfaces
10. 2D Arrays
- Hello2DArrays
- Coding Exercises: 2D Arrays
11. Composition
12. Algorithms
- Coding Exercises: Algorithms
13. Recursion
- Factorial
- Coding Exercises: Recursion
14. File IO
Appendix A: Numeric Conversion
Appendix B: Processing Libraries

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© 2025 Darren Kessner