UML：信号 classifier 与 class classifier

Question

如果我对信号的理解是正确的，那么这是两个或多个对象之间的异步消息。例如在 UML 中我们有一个信号分类器：

-----------------
|  << signal >> |
|  SomeEvent    |
-----------------
|id:Int         |
|text:String    |
-----------------
|getId()        |
|getText()      |
-----------------

那么我们可以在Java中这样写这个信号：

class SomeEvent{
  private final int id;
  private final String text;
  //+constructor + getters
}

但是，在 Java 中我们有一个 CLASS，但是在 UML 中我们有一个 SIGNAL 分类器，但没有 CLASS 分类器（更新：我的意思是在这个例子中 )。怎么解释呢？

Answer 1

事实上UML比Java更丰富。在 UML 中，信号、Class、组件和协作分类器概念将对应于 Java Class.

Answer 2

您关于 UML 信号的讨论是正确的。

来自规范：

10.3.3.1 Signals

A Signal is a specification of a kind of communication between objects in which a reaction is asynchronously triggered in the receiver without a reply. The receiving object handles Signals as specified by clause 13.3. The data carried by the communication are represented as attributes of the Signal. A Signal is defined independently of the Classifiers handling it.

However, in Java we have a CLASS, but in UML we have a SIGNAL classifier, but not a CLASS classifier. How to explain it?

UML 确实有一个 CLASS classifier，来自规范。（强调我的）：

11.4 Classes

... The purpose of a Class is to specify a classification of objects and to specify the Features that characterize the structure and behavior of those objects.

11.4.4 Notation

A Class is shown using the Classifier symbol. As Class is the most widely used Classifier, no keyword is needed to indicate that the metaclass is Class.

UML 是独立于编程语言的。

在 Java 中，UML class 和信号 classifiers 被实现为 classes.

另一个例子：UML有接口classifier，但是C++没有接口。 C++ 中的接口将是抽象的（纯虚拟的）class.

UML：信号 classifier 与 class classifier

UML: signal classifier vs class classifier

java

uml