Decompiling Java Class Files

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What program can I use to decompile a class file? Will I actually get Java code, or is it just JVM assembly code?

On Java performance questions on this site I often see responses from people who have "decompiled" the Java class file to see how the compiler optimizes certain things.
Jun 1, 2018 in Java by developer_1
 • 3,350 points • 1,289 views

1 answer to this question.

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There are a few decompilers out there... A quick search yields:

  1. Procyon: open-source (Apache 2) and actively developed
  2. Krakatau: open-source (GPLv3) and actively developed
  3. CFR: open-source (MIT) and actively developed
  4. JAD
  5. DJ Java Decompiler

And many more.

These produce Java code. Java comes with something that lets you see JVM byte code (javap).

answered Jun 1, 2018 by Rishabh
 • 3,620 points

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