final class without implementing interfaces can be creating by Spring

Changchao Liu :

This is a final class without implementing interfaces:

@Component("finalClass")
public final class FinalClass {
    public String hello(){
        return "hello";
    }
}

This is the test class:

 public class Test {
    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        FinalClass finalClass = (FinalClass) ac.getBean("finalClass");
        System.out.println(finalClass.hello());
    }
}

It can run. The final class can not be extending, and it doesn't implement any interfaces. Why can Spring create it?

Andronicus :

It's because spring uses reflection to do that, which can overcome those limitations. That's why spring can create proxies over objects, that are final, reach to private members and so on.