UML 序列图 - 如何表示实例化对象的方法参数 [英] UML sequence diagram - how to represent method arguments that instantiate objects

问题描述

我不确定如何在序列图中(在 Ruby 中)表示如下内容:

I'm not sure how to represent something like the following in a sequence diagram (in Ruby):

 class FirstClass
   def process 
       thing = SecondClass.new('string argument', third_class, 2) 
    end 

   def third_class 
       ThirdClass.new('another string argument',)
   end
 end

序列中的第一条消息是对 FirstClass 实例的调用，让我感到困惑的部分是如何表示将 ThirdClass.new 作为参数传递给 SecondClass 初始值设定项.

The first message in the sequence is a call to an instance of FirstClass, and the part that's tripping me up is how to represent the ThirdClass.new being passed as an argument to the SecondClass initializer.

推荐答案

基本上，您只展示对象的实例化方式和顺序，而不是分配对象的位置:

Basically you just show how and in which order the objects are instantiated and not where they are assigned:

因此，首先创建 ThirdClass，然后创建 SecondClass，在其中传递 ThirdClass 参数.

So first the ThirdClass is created and then SecondClass where you pass a ThirdClass parameter.

我不知道确切的 Ruby 语法.所以 new 是一个占位符.其他语言需要类名，Python 使用 __init__ 等.但是虚线箭头线表示这是一个对象创建.

I don't know the exact Ruby syntax. So the new is a place holder. Other languages require the class name, Python uses __init__, etc. But the dashed arrow line shows that's it's an object creation.

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