public static Object newProxyInstance(ClassLoader loader, Class<?>[]interfaces,InvocationHandler h) throws IllegalArgumentException {
    // 检查 h 不为空，否则抛异常
    if (h == null) {
        throw new NullPointerException();
    }

    // 获得与指定类装载器和一组接口相关的代理类类型对象
    Class cl = getProxyClass(loader, interfaces);

    // 通过反射获取构造函数对象并生成代理类实例
    try {
        Constructor cons = cl.getConstructor(constructorParams);
        return (Object) cons.newInstance(new Object[] { h });
    } catch (NoSuchMethodException e) { throw new InternalError(e.toString());
    } catch (IllegalAccessException e) { throw new InternalError(e.toString());
    } catch (InstantiationException e) { throw new InternalError(e.toString());
    } catch (InvocationTargetException e) { throw new InternalError(e.toString());
    }
}

public static Object newProxyInstance(ClassLoader loader, Class<?>[]interfaces,InvocationHandler h) throws IllegalArgumentException {
    // 检查 h 不为空，否则抛异常
    if (h == null) {
        throw new NullPointerException();
    }

    // 获得与指定类装载器和一组接口相关的代理类类型对象
    Class cl = getProxyClass(loader, interfaces);

    // 通过反射获取构造函数对象并生成代理类实例
    try {
        Constructor cons = cl.getConstructor(constructorParams);
        return (Object) cons.newInstance(new Object[] { h });
    } catch (NoSuchMethodException e) { throw new InternalError(e.toString());
    } catch (IllegalAccessException e) { throw new InternalError(e.toString());
    } catch (InstantiationException e) { throw new InternalError(e.toString());
    } catch (InvocationTargetException e) { throw new InternalError(e.toString());
    }
}