首次飞行指南选择合适的地点 带一个专家 Plan the Flight Limit the Damage 首次飞行指南 学习飞行 是一个很大的乐趣! These guidelines are designed to ensure that your first flight experience is enjoyable, educational, ...
访问器 访问器 Accessors 访问器 What is an accessor? 访问器 是什么? We briefly discussed instance variables in an earlier chapter, but haven’t done much with them yet. 我们在前面的章节中简要地讨论了实例变...
类 类 Classes 类 The real world is filled by objects, and we can classify them. 现实世界中充满了对象,并且我们还可以给它们分类。 For example, a very small child is likely to say “bow-wow” when seein...