关于step7的接口newProxyInstance()参数问题 #31

public static Object newProxyInstance(ClassLoader loader,
                                          Class<?>[] interfaces,
                                          InvocationHandler h) {
        Objects.requireNonNull(h);

        final Class<?> caller = System.getSecurityManager() == null
                                    ? null
                                    : Reflection.getCallerClass();

        /*
         * Look up or generate the designated proxy class and its constructor.
         */
        Constructor<?> cons = getProxyConstructor(caller, loader, interfaces);

        return newProxyInstance(caller, cons, h);
    }