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Thanks for the request! A .class file is compiled Java bytecode. Turning it back into .java source is decompiling, which is a programming tool's job rather than a file conversion. The result is reconstructed code, not the original source.
What works today: a Java decompiler does exactly this.
IntelliJ IDEA opens a .class file as decompiled Java directly.
Standalone decompilers such as Vineflower or CFR do the same.
This is outside what Filee does, so I'm closing it.
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KnifeLemon commentedon Oct 29, 2026
Thanks for the request! A
.classfile is compiled Java bytecode. Turning it back into.javasource is decompiling, which is a programming tool's job rather than a file conversion. The result is reconstructed code, not the original source.What works today: a Java decompiler does exactly this.
.classfile as decompiled Java directly.This is outside what Filee does, so I'm closing it.