How to protect a java application from reverse-engineering or code stealing? [closed]

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I want to reveal my desktop java application to public, but I'm not sure how to protect it from reverse-engineering or source code stealing?

Is it possible to convert the application to an exe file? and if it is, wouldn't that be enough to protect it?

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If it's really worth someone's time to reverse engineer your source from the binary, they will. You might be able to make it slightly harder, but never impossible.

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You can use a Java Obfuscator such as ProGuard.

ProGuard is a free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.

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A Java executable and a native executable are both just a bunch of machine code (with optional annotations and stuff). So there's essentially no difference in terms of how easy it is to reverse-engineer.

If you are compiling with javac, you can use the -g:none flag to eliminate all debug info from being compiled into the executable.