декомпилятор java .class

The Java Decompiler link seems to be down – 

+100 and one... –  Nov 17 '11 at 23:59

+1 for Java Decompiler! I was stuck with JAD for a long time, although it works well. –  Oct 25 '10 at 19:15

+1 It's worth mentioning that it's also modularized, so the core (implemented in C++) can be leveraged elsewhere. –  May 5 '10 at 4:02

Thanks for pointing this one out... it looks like a nice project, and we have needed one with solid 1.5 support for a long time. –  Nov 7 '08 at 16:28

It works with compilers from jdk1.1.8 up to jdk1.7.0, and others (jikes, jrockits, ...).

explicit support for decompiling and analyzing Java 5+ вІ

(Yet another Fast Java decompiler) has:

Cavaj Java DecompilerвІ, are powered by JAD : they can not display Java 5 sources.

DJ Java DecompilerвІ or вІ

Most of the Java decompilers downloadable today from the Internet, such as вІ

The lastest Java version supported by JAD, the famous Java decompiler written by Mr. Pavel Kouznetsov, is .

The final release of JSR 176, defining the major features of J2SE 5.0 (Java SE 5), has been published on september 30, 2004.

The art of "decompiling" can also be thought upon as reverse engineering. Although sometimes when reverse engineering something you don't always have access to binaries. –  Jun 13 '09 at 10:53

What program can I use to decompile a class file? Does you 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.

decompiler - How do I "decompile" Java class files? - Stack Overflow