| 元素名称 |
符号图例 |
含义 |
| Class |
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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
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| Interface |
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接口名称通常以字母 "I" 开头。
接口定义通常也用于抽象类。
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| Note |
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任意的描述性文字。
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| Package |
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将类和接口分组。
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Inheritance
Generalization
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B 继承自 A。
B inherits from A.
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| Realization |
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B 实现了 A。
B implements A.
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| Association |
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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.
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| Association (one way) |
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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.
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| Aggregation |
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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.
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| Composition |
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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.
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| Dependency |
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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).
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