like the e-r model,the object-oriented model is based on a collection of objects. an objects contains values stored instance variables within the object. an object also contains bodies of code that operate on the object. these bodies of code are called method.
objects that contain the same types of values and the same methods are grouped together into classes. a class may be viewed as a type definition is similar to programming language abstract data type(adt).

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象这个e-r 模型, 面向对象的模型根据对象的一件收藏品 。对象包含价值被存放的事例可变物在这个对象之内。对象并且包 含操作这个对象代码这些身体叫做method.objects 包含同样类型价 值并且同样方法一起被编组入类代码的身体。类也许被观看作为型 定义与编程语言抽象数据type(adt) 是相似。