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    <p>Update February 2016:</p> <p><a href="http://www.javadecompilers.com/" rel="noreferrer">www.javadecompilers.com</a> lists JAD as being:</p> <blockquote> <p>the most popular Java decompiler, but primarily of this age only. Written in C++, so very fast.<br> Outdated, unsupported and does not decompile correctly Java 5 and later</p> </blockquote> <p>So your mileage may vary with recent jdk (7, 8).</p> <p>The same site list other tools.</p> <p>And javadecompiler, as noted by <a href="https://stackoverflow.com/users/1377112/salvador-valencia">Salvador Valencia</a> in <a href="https://stackoverflow.com/questions/272535/how-do-i-decompile-java-class-files/272595#comment79458645_272595">the comments</a> (Sept 2017), offers a SaaS where you upload the <code>.class</code> file to the cloud and it returns you the decompiled code. </p> <hr> <p>Original answer: Oct. 2008</p> <ul> <li>The final release of JSR 176, defining the major features of J2SE 5.0 (Java SE 5), has been published on September 30, 2004.</li> <li>The lastest Java version supported by JAD, the famous Java decompiler written by Mr. Pavel Kouznetsov, is <strong><a href="http://varaneckas.com/jad/" rel="noreferrer">JDK 1.3</a></strong>.</li> <li>Most of the Java decompilers downloadable today from the Internet, such as “DJ Java Decompiler” or “Cavaj Java Decompiler”, are powered by JAD: they can not display Java 5 sources.</li> </ul> <p><a href="http://jd.benow.ca/" rel="noreferrer">Java Decompiler</a> (Yet another Fast Java decompiler) has:</p> <ul> <li>Explicit support for decompiling and analyzing <strong>Java 5+</strong> “.class” files.</li> <li>A nice GUI:</li> </ul> <p><img src="https://i.stack.imgur.com/jH9Pd.png" alt="screenshot"></p> <p>It works with compilers from JDK 1.1.8 up to JDK 1.7.0, and others (<a href="https://en.wikipedia.org/wiki/Jikes" rel="noreferrer">Jikes</a>, <a href="https://en.wikipedia.org/wiki/JRockit" rel="noreferrer">JRockit</a>, etc.). </p> <p>It features an online <a href="http://jd.benow.ca/#jd-online" rel="noreferrer">live demo version</a> that is actually fully functional! You can just drop a jar file on the page and see the decompiled source code without installing anything.</p>
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    1. POHow do I "decompile" Java class files?
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    1. CO+1 It's worth mentioning that it's also modularized, so the core (implemented in C++) can be leveraged elsewhere.
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    2. COjd-gui-0.3.3 also available [here](http://code.google.com/p/innlab/downloads/detail?name=jd-gui-0.3.3.windows.zip&can=2&q=)
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    3. CO+1 for the info! If Java decompilers are so damn easy, how does one go about protecting his IP? Is there an obfuscation technique to work around these decompilers?
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