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Chapter 1. Getting Started
- Starting a new project
Chapter 2. Strings
Chapter 3. Numbers
Chapter 4. Data Structures
- Using associative arrays
Chapter 5. Good Coding Practices
Chapter 6. Files and I/O
Chapter 7. Dates and Times
Chapter 9. Testing and Debugging
Chapter 10. Data Formats and Serialization
Chapter 11. HTML and the Web

Chapter 1. Getting Started
- Starting a new project
Chapter 2. Strings
Chapter 3. Numbers
Chapter 4. Data Structures
- Using associative arrays
Chapter 5. Good Coding Practices
Chapter 6. Files and I/O
Chapter 7. Dates and Times
Chapter 9. Testing and Debugging
Chapter 10. Data Formats and Serialization
Chapter 11. HTML and the Web

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Chapter 9. Testing and Debugging

Java Chapter 9.
Testing and Debugging

Printing debug output

Let’s get some code on the screen.

Using an interactive shell (REPL)

Starting a REPL in Java is simple with the jshell tool introduced in Java 9.

Using a debugger

Let’s say you’ve got a simple Java program that’s acting up, and you can’t figure out why.

Writing tests

Java developers primarily use two testing frameworks.