security - What are the techniques to protect preventively own software developed in Java etc. against 0days exploit? -

I just stumbled on this article: Lessons from Anonymous on Cyber ​​is cooking a CyberWire, Attacks show how deeply the war goes? Are there really techniques to protect their own developed software against highly developed techniques?

For example, a simple CRC probe can not be enough?

uPDATE: My question is that the software is not about saving from cracking, it is about protecting the user PC from infiltration. If the CRC investigates and if this is not correct, then why would not it be enough to avoid walking?

There is no guaranteed full security If you want your software to be ineffective or unmatched, Do not even release.