Code Tool Examples

Welcome to the “let’s build tiny tools” corner of the site.

This section is where you’ll find practical, beginner-friendly examples of simple tools implemented in both Java and Python. The goal is not to build enterprise software. The goal is to show how real programs come together from small, understandable pieces.

You’ll see projects like:

• A small terminal spreadsheet
• A basic terminal word processor
• A tiny text editor (way simpler than vi)
• A few other utilities you can actually use while learning

If you’ve ever thought, “I understand syntax, but how do I build an actual program?” this section is for you.

Pick a language track and start shipping little tools.

• Download All Example Sources
• Java Tool Examples
• Python Tool Examples

Tool Catalog

Java

• Tiny Text Editor in Java
• TUI Word Processor in Java
• TUI Spreadsheet in Java
• Todo List TUI in Java
• Pomodoro Timer TUI in Java

Python

• Tiny Text Editor in Python
• TUI Word Processor in Python
• TUI Spreadsheet in Python
• Todo List TUI in Python
• Pomodoro Timer TUI in Python

Mental Model Catalog

These companion articles explain how to think about each tool’s structure, state, and control flow while you read the implementation.

Java Mental Models

• Mental Model: Tiny Text Editor in Java
• Mental Model: TUI Word Processor in Java
• Mental Model: TUI Spreadsheet in Java
• Mental Model: Todo List TUI in Java
• Mental Model: Pomodoro Timer TUI in Java

Python Mental Models

• Mental Model: Tiny Text Editor in Python
• Mental Model: TUI Word Processor in Python
• Mental Model: TUI Spreadsheet in Python
• Mental Model: Todo List TUI in Python
• Mental Model: Pomodoro Timer TUI in Python