How to use IntelliJ IDEA to find all unused code?

When I am in a .java file, the unu开发者_运维问答sed code is usually grayed out or has a green underline saying this code will probably (probably because of some weird JNI/Reflection corner cases) be unused. But I have this project with thousands of Java files and I want to find all instances of such probable-unused code. How can I do that in IntelliJ IDEA?

Just use Analyze | Inspect Code with appropriate inspection enabled (Unused declaration under Declaration redundancy group).

Using IntelliJ 11 CE you can now "Analyze | Run Inspection by Name ... | Unused declaration"

In newer versions of IntelliJ it's under Code -> Analyze Code -> Run Inspection by Name.

In IntelliJ versions before that, you should run it from Analyze -> Run Inspection By Name:

Than, pick Unused declaration:

And finally, uncheck the Include test sources:

After you've run the Inspect by Name, select all the locations, and make use of the Apply quick fixes to all the problems drop-down, and use either (or both) of Delete unused parameter(s) and Safe Delete.

Don't forget to hit Do Refactor afterwards.

Then you'll need to run another analysis, as the refactored code will no doubt reveal more unused declarations.

A picture is worth a thousand words! IntelliJ IDEA 2022.x.x

• Go to the code tab, analyze code, and run inspection by name.

• Select what you need