CodeExplorer

CodeExplorer is a free Idea plugin that helps to analyze Java code:
find all method call chains to the method and what methods called from the method.

Analysis results (methods and calls between them) are shown on a handy diagram in the CodeExplorer tool window:

CodeExplorer diagram

You can add more nodes to the opened diagram by double-clicking on diagram nodes or executing commands from the context menu for diagram nodes.

Execute plugin commands from Analyze menu (Method structure, Methods and calls in, Method call chains to), and plugin will show analysis results on the diagram:

CodeExplorer menu

Download the plugin from Idea plugin page.

See demo and read FAQ for more information about plugin features.

CodeExplorer
See demo, read FAQ,

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