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UML (:pineapple:diagrams (:four:state diagram, :five:timing diagrams, …

- - - - :one:Message
      - :two:Actions
      - :three:Connectors
      - :question:Differences between Message & Actions
  - - - Definition
      - :moneybag:contents
        
        :one:State
        
        Initial state, final state, Composite state ,Substates, History state
        
        substate
        
        states that are nested states.
        
        :icecream:validating, selecting, etc are the substates of the Active
        
        :arrow_right:Active is a composite state
        
        :star:composite states can have its own initial & final state
        
        :warning:diagram: 1 initial state & >=1 final states
        
        there can be multiple initial states
        
        :two:Transitions
        
        :three:Event
        
        :question:是指导致transition的原因吗
        
        :four:Activities
      - Transition
        
        :one:expression of transition
        
        event-signature '[' guard-condition ']' '/' action
        
        :two:event signature
        
        evenet-name '(' comma-separated-parameterlist ')'
        
        :explode:transition is the words above the line. Transition = Event / Action
        
        :bread:Is a relationship between two states indicating that an object in the first state will perform certain actions and enter the second state when a specified event occurs and specified conditions are satisfied
      - Action
      - :star:the states of an object
      - :icecream:example
  - - - :explode:a step of activity is called an action
    - - 从一个action到另一个action
  - - - ----.
    - - aggregation & composition
      - ◇----
- - - - extends the vocabulary of the UML
- - - - :one:Aggregation
        
        :icecream:example
        
        :one:一个company类有很多employees
        
        :two:1个雁群中有很多大雁
      - :two:Composition
        
        :bread:A has a 'a'
        
        A a
      - :star:可以在菱形和箭头旁边写数字,表示对应的数量关系
    - - :poultry_leg:Realization应该不是指实现接口的意思吧
        
        :palm_tree:就是A实现了B接口
      - :icecream:大雁和飞翔
      - :globe_with_meridians:Generalization
        
        :explode:G不需要在新类中写父类的方法,而R的新类需要实现这些方法
    - - :question:这里的企鹅和气候是什么relationship