继承表达的就是一件事：子类是父类的一种。继承是"我是一种"，组合是"我有一个"。完全两码事，一定要注意区分。 之前帮人 review 代码，看到一个报表类继承了数据库类。 问原因，说是："省得再写数据库连接逻辑。" 这是对继承的严重误解。继承从来不是 ...

In Object Oriented Programming, written classes represent and create real world objects. Class attributes and procedures are known as methods. The class is the blueprint, or template, that defines ...

Over the past decade, I've jammed myself (and my luggage!) into free airport shuttles, slept on my friends' partially deflated air mattresses, and woken up in the wee hours of the morning to catch a ...