Maybe Ctrl + Alt + H in Eclipse / IntelliJ IDEA ? (albo present in NB somewhere) Or "data flow from/to" in IntelliJ IDEA?

Answer from KarolDepka on Stack Overflow
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Computer Science Circles
cscircles.cemc.uwaterloo.ca โ€บ java_visualize
Java Visualizer
The visualizer supports StdIn, StdOut, most other stdlib libraries, Stack, Queue, and ST. Click for FAQ. How can I access Java's built-in Stack/Queue instead of the introcs one? At the top of your program, write import java.util.Stack; โ€” note, import java.util.*; won't work. How do I get shorter URLs? For example code...
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Python Tutor
pythontutor.com โ€บ java.html
Online Java Compiler, Visual Debugger, and AI Tutor - Learn Java programming by visualizing code
Free online Java compiler and visual debugger. Step-by-step visualization with AI tutoring to learn object-oriented programming.
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Prutor
python.prutor.ai โ€บ code โ€บ visualize.html
Visualize Python, Java, JavaScript, C, C++, Ruby code execution
Write code in ยท Python 3.6 ยท Python 2.7 ยท Python 3.6 with Anaconda (experimental) Java 8 ยท C (gcc 4.8, C11) C++ (gcc 4.8, C++11) JavaScript ES6 ยท TypeScript 1.4 ยท Ruby 2.2 ยท Someone is typing ... Visualize Execution Live Programming Mode ยท hide exited frames [default] show all frames (Python) inline primitives and try to nest objects ยท
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UW Computer Sciences
pages.cs.wisc.edu โ€บ ~cs302 โ€บ resources โ€บ visualizer.html
What should you do with Java Visualizer
For example: System.out.println( "Welcome to Java Visualizer.\n" ); Click Click "Visualize Execution" button. Watch what is diagrammed in memory or output to the console window. Repeat until all statements have been executed and program terminates. Edit code with some statement that you want to review.
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University at Buffalo
cse.buffalo.edu โ€บ jive
JIVE: Java Interactive Visualization Environment
JIVE is an interactive execution environment for Eclipse that provides visualizations of Java program execution at different levels of granularity.
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Initial Commit
initialcommit.com โ€บ blog โ€บ java-visualizer
Getting Started with Java Visualizer
The Java Visualizer is an in-browser interactive development environment that developers can use to easily step through their Java code. After entering code in the website, users can click visualize execution to start stepping through their code.
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University of Virginia
cs.virginia.edu โ€บ ~lat7h โ€บ cs1 โ€บ JavaVis.html
Java Program Flow Visualizer
The execution of a while loop can be pictured with time on a horizontal axis and code vertical. You may enter a subset of legal java code below.
Find elsewhere
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Findtheflow
findtheflow.io
Visualize Java code execution
Flow Visual Tracer records the execution of Java applications. The execution is visualized as graphs, giving you better insight into the program structure and execution paths. You can replay the execution forward and also back in time. Unlike many existing Java development tools, Flow offers ...
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JetBrains
plugins.jetbrains.com โ€บ plugin โ€บ 11512-java-visualizer
Java Visualizer - IntelliJ IDEs Plugin | Marketplace
A tool to visualize the call stack and objects on the heap (as a box and pointer diagram) while debugging Java applications.
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GitHub
github.com โ€บ ProgLanguages โ€บ Java-code-visualizer
GitHub - ProgLanguages/Java-code-visualizer: The site can be viewed online at:
The goal of this project is provide a visualization of multiple data structures interpreting Java 7 code wrote by an user.
Author ย  ProgLanguages
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Eclipse Marketplace
marketplace.eclipse.org โ€บ free-tagging โ€บ visualizer
visualizer | Eclipse Plugins, Bundles and Products - Eclipse Marketplace | Eclipse Foundation
Sourcecode Visualizer is an Eclipse plugin for visualizing Java sourcecode. It draws a control flow graph alongside of Java source code.
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Java Code Geeks
examples.javacodegeeks.com โ€บ home โ€บ java development โ€บ core java
Java Visualizer Tutorial - Java Code Geeks
October 31, 2021 - Java visualizer is a plugin for IntelliJ IDE to look at the code execution steps during debugging & check the values of the variables on the path of execution.
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Python Tutor
pythontutor.com โ€บ visualize.html
Python Tutor - Visualize Code Execution
Free online compiler and visual debugger for Python, Java, C, C++, and JavaScript. Step-by-step visualization with AI tutoring.
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Code-nerd
code-nerd.com โ€บ 2021 โ€บ 04 โ€บ 23 โ€บ algorithm-visualizer-with-java
Algorithm Visualizer With Java โ€“ Code-Nerd
I recently created an algorithm visualizer in Java using JavaFX. Itโ€™s a desktop application that demonstrates various sorting, path-finding and maze-building algorithms.
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Python Tutor
pythontutor.com โ€บ articles โ€บ java-visualizer.html
How the Python Tutor visualizer can help students in your Java programming courses - Python Tutor
Summary: This article is meant for instructors who teach Java programming. Despite its name, Python Tutor is a widely-used web-based visualizer for Java that helps students to understand and debug their code.
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Amigoscode
amigoscode.com โ€บ blogs โ€บ how-to-use-java-visualizer-for-code-debugging-and-learning
How to Use Java Visualizer for Code Debugging and Learning
June 18, 2025 - A Java visualizer is a sophisticated tool that creates graphical representations of your code's execution in real-time. Instead of just reading static text and trying to mentally trace through your program's logic, you get a dynamic, interactive ...
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GitHub
github.com โ€บ daveagp โ€บ java_visualize
GitHub - daveagp/java_visualize: Visualization for Java, using the Online Python Tutor frontend
FAQ -- click on "Click for FAQ" on the visualizer page MORE INFO -- index.html is a modified version of visualize.html -- jv-frontend.js is a modified version of opt-frontend.js -- java_safe_ram_maketrace.php connects the frontend to the backend -- config.* is used for configuration stuff specific to your server -- pytutor-customizations.{js,css} overrides some behaviour of OPT -- example-code is a directory full of example Java files to visualize Note that in the entire frontend, only the two .php files are written in a server-side language.
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Languages ย  JavaScript 69.7% | CSS 12.8% | Java 7.6% | HTML 6.5% | PHP 3.4% | JavaScript 69.7% | CSS 12.8% | Java 7.6% | HTML 6.5% | PHP 3.4%
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Graphlytic
graphlytic.com โ€บ blog โ€บ how-to-visualize-java-source-code-with-graphlytic-and-jqassistant
How to Visualize Java Source Code with Graphlytic and jQAssistant | Graphlytic
Looking at source code in the form of a graph can bring multiple benefits for the team. This post will show how to quickly set up graph visualization of a Java codebase using Maven, jQAssistant, Neo4j graph database, and Graphlytic Desktop.