oop - Explanation of the UML arrows - Stack Overflow
2023年4月20日 · Composite aggregation is defined in the UML spec as follows: Composite aggregation is a strong form of aggregation that requires a part object be included in at most one composite object at a time. If a composite object is deleted, all of its partinstances that are objects are deleted with it.
Direction of the association arrow in UML class diagrams
2009年12月15日 · The arrows describe the ways you can navigate. So in this diagram you can go from order to customer. And for the other way: no arrow means NOT "not navigable", but "no comment". There is no definite right way to do it.
UML relationships - dashed line vs solid line - Stack Overflow
2014年11月17日 · To use the function above the car will have to create an instance of the door. Class Car(){. Door door1 = new Door(); door1.open(); } In this way you have created a dependency. So the solid line is just pointing an object (1) to another object (2), but when you start using the object (1) it becomes a dependency.
What does a diamond sign signify in UML class diagrams?
From wikipedia: In UML, it is graphically represented as a hollow diamond shape on the containing class end of the tree with a single line that connects the contained class to the containing class.The aggregate is semantically an extended object that is treated as a unit in many operations,although physically it is made of several lesser objects.
uml - What does the arrow mean in a Class Diagram? - Software ...
2012年10月8日 · 9. I need help trying to understand what the meaning of the arrow in a UML Class Diagram is, more specifically in this Composite Diagram. What's the difference between the simple line (from a class to another one) and the arrow (not the inheritance arrow, I refer to the black one)? uml. class-diagram.
What is the meaning of dashed arrow in UML class diagram?
2013年7月21日 · 6. The dashed arrow (from client to ConcreteCommand) means that there is an (unidirectional) association between instances of these classes. An instance of client is using an instance of ConcreteCommand but lifecycle of ConcreteCommand (creation and destruction) are not depending of Client instance. The direction of the arrow means that Client ...
uml - What's is the difference between include and extend in use …
2009年11月8日 · Inclusion is used to show how a use case breaks into smaller steps. The included use case is at the arrowhead end. Extend [6] Meanwhile, an extending use case adds goals and steps to the extended use case. The extensions operate only under certain conditions. The extended use case is at the arrowhead end.
java - Open arrow with solid line in UML? - Stack Overflow
5. Note that the last two arrow types are NOT part of UML class diagrams. The first one is used in sequence diagrams (v1.4 and later) and the second one is inaccurate; asynchronous messages used an open half arrowhead prior to 1.4. With 1.4 and later, the open arrowhead means asynchronous and the filled arrowhead means synchronous as in this list.
uml - Use Case Diagrams - Are arrows absolutely necessary
As the interaction between the subjects (eg. Use Case and actor) is by definition bi-directional (eg. actor does something, system responds and so on). You will also find sample Use Case diagrams in this document to further your point. Of course for other Use Case constructs such as includes and extends arrows make sense and is required.
Are return arrows allowed in a UML Activity Diagram
2016年3月16日 · I would like to represent the following in a UML Activity Diagram. 1) User requests a product list from Application. 2) Application requests product list from Database. 3) Database returns product list to Application. 4) Application displays list to User. Originally I thought this would be a simple case of arrows travelling from left to right ...