类与类之间的关联关系

Teacher

-teacherNo：String

+teach():void

University

-teas:List<Teacher>

Address

Customer

-address: Address

Head

-mouth: Mouth

-products: List<Product>

双向关联

Driver

-name:String

+drive(Car car):void

Student

-studentNo：String

+study()：void

依赖关系

Car

+move():void

自关联

Node

-subNode:Node

Mouth

+eat():void

Person

-name：String-age：int

+speak()：void

组合关系

聚合关系(一对多的关系)

单项关联

继承关系

Product

-customer:Customer

public void drive(Car car){      car.move();// 汽车移动}