面向对象编程的特点（Object-oriented programming）
时间：2010-12-16 来源：Arthur Peng
1. Everything is an object.
2. A program is a bunch of objects telling each other what todo by sending messages.
3. Each object has its own memory made up of other objects.
4. Every object has a type.
5. All objects of a particular type can receive the samemessages.
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