https://github.com/atp-mipt/ljv

Lightweight Java Visualizer
https://github.com/atp-mipt/ljv

graphviz-dot java

Last synced: 11 days ago
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Lightweight Java Visualizer

• Host: GitHub
• URL: https://github.com/atp-mipt/ljv
• Owner: atp-mipt
• License: gpl-3.0
• Created: 2020-03-23T16:51:10.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-04-07T11:57:33.000Z (over 2 years ago)
• Last Synced: 2025-08-20T22:57:24.021Z (about 2 months ago)
• Topics: graphviz-dot, java
• Language: SCSS
• Homepage: https://atp-mipt.github.io/ljv/
• Size: 4.88 MB
• Stars: 292
• Watchers: 6
• Forks: 14
• Open Issues: 10
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# The Lightweight Java Visualizer (LJV)

[![Actions Status: build](https://github.com/atp-mipt/ljv/workflows/build/badge.svg)](https://github.com/atp-mipt/ljv/actions?query=workflow%3A"build")

[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.atp-fivt/ljv/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.atp-fivt/ljv)

LJV a is tool for visualizing Java data structures, using [Graphviz](http://graphviz.gitlab.io/).

It was developed by [John Hamer](https://www.gla.ac.uk/schools/computing/staff/?webapp=staffcontact&action=person&id=4cdcebe68a94) in 2004 and released under GNU GPL (see the [original project page](https://www.cs.auckland.ac.nz/~j-hamer/LJV.html)).

This project aims to upgrade this tool to modern Java and make it an open source library in the modern sense of the word.

See [documentation](https://atp-mipt.github.io/ljv/) and [JavaDoc](https://atp-mipt.github.io/ljv/apidocs/).

## How to use

The tool requires Java 11 or later version. Pull in the LJV dependency:

```xml

  org.atp-fivt

  ljv

  1.04

```

Execute the following (`obj` can be any object that you wish to visualize):

```java

public class Main {

    public static void main(String[] args) {

        browse(new LJV(), Map.of(1, 'a', 2, 'b'));

    }

    public static void browse(LJV ljv, Object obj) {

        try {

            var dot = URLEncoder.encode(ljv.drawGraph(obj), "UTF8")

                        .replaceAll("\\+", "%20");

            Desktop.getDesktop().browse(

                new URI("https://dreampuf.github.io/GraphvizOnline/#" 

                        + dot));

        } catch (Exception e) {

            throw new IllegalStateException(e);

        }

    }

}

```

A browser window will appear with a diagram that will look like this: