| 元素名称 |
符号图例 |
含义 |
| Class |
|
包含类的名称、属性和方法定义。 可见性修饰符：
- + public
- - private
- # protected
- 无修饰符为 internal
|
| Interface |
|
接口名称通常以字母 "I" 开头。 接口定义通常也用于抽象类。 |
| Note |
|
任意的描述性文字。 |
| Package |
|
将类和接口分组。 |
| Inheritance Generalization |
|
B 继承自 A。 B inherits from A. |
| Realization |
|
B 实现了 A。 B implements A. |
| Association |
 |
A 和 B 相互调用和访问对方的元素。 A and B call and access each other’s elements. |
| Association (one way) |
 |
A 可以调用和访问 B 的元素，但 B 不可以访问 A 的元素。 A can call and access B’s elements, but not vice versa. |
| Aggregation |
|
A 中拥有一个 B，但 B 脱离于 A 仍然可以独立存活。 A has a B, and B can outlive A. A "uses" B = Aggregation : B exists independently (conceptually) from A. |
| Composition |
|
A 中拥有一个 B，B 脱离 A 后在系统中没有任何存活的意义。 A has a B, and B depends on A. A "owns" B = Composition : B has no meaning or purpose in the system without A. |
| Dependency |
|
B 的变化会影响 A，则 A 依赖于 B。 A dependency exists between two elements if changes to the definition of one element (the supplier) may cause changes to the other (the client). |
