Learn IJAVA with Real Code Examples

IJava integrates Java with Jupyter Notebooks, allowing live execution of Java code in cells.

Supports inline display of outputs, plots, and interactive elements within the notebook.

Combines Java code, Markdown explanations, and visualizations in one document.

Notebooks with IJava can be exported to HTML, PDF, or slides for sharing.

Useful for teaching, experimentation, and exploratory Java development.

Java kernel for Jupyter Notebook

Integration with Maven or Gradle for dependencies

Interactive cell-based code execution

Support for data visualization libraries (e.g., XChart, JFreeChart)

Notebook structure for combining narrative and code

Notebook: contains code cells and Markdown

Cell types: code (Java) and Markdown

Kernel: IJava executes Java code

Output: displayed inline in notebook

Notebook metadata stores kernel and document info

Notebook file (.ipynb) as main unit

Code cells for Java logic

Markdown cells for documentation

Optional supporting Java files or libraries

Inline visualization for results

Open a notebook with IJava kernel

Write Java code in code cells

Document logic using Markdown

Execute cells and inspect outputs

Save, share, or export notebook

Beginner: learn Java syntax and basics

Intermediate: explore algorithms and data structures

Advanced: prototyping Java applications

Expert: create interactive tutorials or experiments

Instructor: teach Java concepts with live examples

IJava vs Jupyter (Python) -> IJava: Java-focused; Jupyter: multi-language, Python-first

IJava vs Replit -> IJava: notebook experiments; Replit: full IDE with hosting

IJava vs IntelliJ IDEA -> IJava: interactive teaching; IntelliJ: professional IDE

IJava vs JSBin -> IJava: Java notebook; JSBin: front-end prototyping

IJava vs CodeHS -> IJava: higher education/prototyping; CodeHS: K-12 Java lessons

2015 - IJava kernel created for Jupyter

2016–2018 - Added support for visualization libraries

2019–2021 - Enhanced stability and library integration

2022–2025 - Community improvements and JupyterLab support

Notebook - .ipynb document with Java cells

Cell - unit of code or markdown

Kernel - IJava executes Java code

Markdown - formatted text

Library - external Java dependency