https://blog.whyno.org/index.php?blogId=15 code class Car { class Wheel { } }   class PlaneWheel extends Car. Wheel { PlaneWheel ( Car car ) { car. super ( ) ; } public static void main ( String [ ] args ) { Car car= new Car ( ) ; PlaneWheel pw= new PlaneWheel ( car ) ; } }   https://blog.whyno.org/index.php?op=ViewArticle&articleId=219&blogId=15 Mon, 13 Nov 2006 20:17:18 +0800 如果您阅读到这篇文章，这就意味着您注册的博客已经申请成功。 https://blog.whyno.org/index.php?op=ViewArticle&articleId=218&blogId=15 Mon, 13 Nov 2006 19:43:44 +0800