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    <p><a href="http://proguard.sourceforge.net/index.html#/FAQ.html" rel="nofollow">ProGuard</a> (which the Android SDK for example ships with to reduce code size), can do all kinds of manipulation to shrink JAR files:</p> <ul> <li>Evaluate constant expressions.</li> <li>Remove unnecessary field accesses and method calls.</li> <li>Remove unnecessary branches.</li> <li>Remove unnecessary comparisons and instanceof tests.</li> <li>Remove unused code blocks.</li> <li>Merge identical code blocks. </li> <li>Reduce variable allocation.</li> <li>Remove write-only fields and unused method parameters.</li> <li>Inline constant fields, method parameters, and return values.</li> <li>Inline methods that are short or only called once.</li> <li>Simplify tail recursion calls.</li> <li>Merge classes and interfaces.</li> <li>Make methods private, static, and final when possible.</li> <li>Make classes static and final when possible.</li> <li>Replace interfaces that have single implementations.</li> <li>Perform over 200 peephole optimizations, like replacing ...*2 by ...&lt;&lt;1.</li> <li>Optionally remove logging code.</li> </ul> <p>They do not mention removing debug info in that list, but I guess they can also do that.</p> <p><strong>Update:</strong> Yes, indeed:</p> <blockquote> <p>By default, compiled bytecode still contains a lot of debugging information: source file names, line numbers, field names, method names, argument names, variable names, etc. This information makes it straightforward to decompile the bytecode and reverse-engineer entire programs. Sometimes, this is not desirable. Obfuscators such as ProGuard can remove the debugging information and replace all names by meaningless character sequences, making it much harder to reverse-engineer the code. It further compacts the code as a bonus. The program remains functionally equivalent, except for the class names, method names, and line numbers given in exception stack traces. </p> </blockquote>
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    1. POAny Java counterpart for `/usr/bin/strip`?
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    1. POAny Java counterpart for `/usr/bin/strip`?
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    1. COHey, that was pretty awesome. Will check it out, thanks! (Here's a +1 right away). Meanwhile, outside of what comes by default with Oracle JDK, is there any comprehensive list of *all* system-level tools for `javac` and `java` (JVM) for things like... speed/memory benchmarking and tuning, monitoring, static/dynamic code analysis, etc. Basically, I don't even know what all is possible with Java (other than regular, high-level programming) and what all kinds of tools are at my disposal to do all of what!!
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    2. COThere is the official docs: http://download.oracle.com/javase/6/docs/technotes/tools/index.html
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    3. COAlso, there are many many third-party tools. The easiest way I've found so far to find them is to ask on SO…
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