关于内在阶级

Question

我正在学习动态代理。但我不知道为什么参数dao不需要'final'来装饰。这是我定义的ProxyFactory类。

private IUserDao dao;

public void setDao(IUserDao dao) {
    this.dao = dao;
}

public Object getProxyInstance(){
    return Proxy.newProxyInstance(
            dao.getClass().getClassLoader(), 
            dao.getClass().getInterfaces(),
            new InvocationHandler() {

                @Override
                public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                    System.out.println("begin......");
                    System.out.println(proxy.getClass());
                    Object result = method.invoke(dao, args);
                    System.out.println("end......");
                    return result;
                }
            });
}