java - How to get source code from .jar file -

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i have project in .jar file.

but lost source code of it.

how source code .jar file.

first of tell if project big , complex, in trouble. generated source code via external tools(no matter whatever tool is) never same real code. code comments, constants, inner classes, etc gets messy.

for simpler code , projects can use -

but know not written in source code.


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