Java class definition in runtime [duplicate]

This question already has answers here: Closed开发者_如何学C 11 years ago.

Possible Duplicate:

How do I programmatically compile and instantiate a Java class?

How to create a new java class at runtime?

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Use Class<?> ClassLoader.defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain)

The problem is that this method is protected. So, you should extend class loader with your own class and call this method from there.