Is there a way to depict dependency of methods of the same class in a class diagram. I have a class which has two methods :-
getArrayListOfLotteries()
removeDuplicateElementsOftheList(ArrayList listOfLotteries)
when you call getArrayListOfLotteries which is a public method , the private method removeDuplicateElementsOftheList would be called before the former returns. Is there a way to somehow show this in a class diagram ?
In the structural class diagram you can show that getArrayListOfLoterries is public and that removeDuplicateElementsOftheList is private or protected (see http://www.uml-diagrams.org/visibility.html)
Then you can use e.g. behavioral sequence diagram to show that getArrayListOfLoterries calls removeDuplicateElementsOftheList by drawing overlapping execution or sending a message to self (see http://www.uml-diagrams.org/sequence-diagrams.html#execution)
In my opinion it is perfectly legal to combine both aspects (both kinds of diagram) into one combined diagram. As far as I remember specification does not disallow it (TODO: link some proof)).
Pure class diagram does not have features to display more complex behavioral aspects (TODO: give some examples of less complex vs. more complex aspects)
Related
I have a sequence diagram, and I would like to create a class diagram from it.
This is the sequence diagram:
I'm struggling with classes operations (which class should I give what operations)
You can derive the class from the life line. Each is an instance of a class. With the used notation you can say that the title corresponds to the class name directly. The actor is some informal compromise and is not a class.
The messages towards a life line correspond to operations of the class. E.g. ViewBookForm has onClick().
In any case you can pinpoint only those operations you have in the diagram. And you can't find out the atributes. So your classes will be skeletons only.
I have class Controller in my java project, which has method like this:
As you can see, in the first line I am getting Singleton instance of ActualModes class and call method getActualModes().
So the first question is, which relatinship I should use in class diagram.
After that I am creating new instane of ModeContext class and then call method executeStrategy. In this case, which relatiship is better ?
It should be like this:
Access to the singleton (note the stereotype which is just convenient and no obligation or general standard) is anonymous and so you just have a dependency. The ModeContext in contrast uses a private (I don't know the scoping rules of the language you used, so I made it pivate) property called context. Note the dot which is saying exactly that.
Disclaimer: UML does not specify a mapping between Java and UML, so every answer to your question is open for debate.
I think both relationships are dependencies, drawn as dashed arrows from Controller to ActualModes and from Controller to ModeContext. The definition of 'dependency' according to the UML 2.5 specification (§7.8.4.1) is:
A Dependency is a Relationship that signifies that a single model Element or a set of model Elements requires other
model Elements for their specification or implementation.
An example of a type of relationship which is in my opinion less suited, is the association, although its definition (§11.5) is quite broad:
An Association classifies a set of tuples representing links between typed instances. (...) An Association specifies a semantic relationship that can occur between typed instances.
One could argue that there are links between Controller and the other two classes, in the form of variables, but these variables are local method variables, which exist only temporarily during the execution of the method. Associations represent more durable links, e.g. class members - as far as I understand UML and as far as I have seen associations used in practice.
I'm trying to understand how can I draw a UML diagram of a program that extends one class and implements another interface. I've made this sketch but I'm not sure if it is correct.
A is a class that has some fields and methods and B is an interface which has some methods. And finally C is extending from A and implements B. ( like public class C extends A implements B in java)
Your diagram is almost correct. The left generalization is drawn like a unfilled triangle.
Edit: In Enterprise Architect you can show the generalization also with the general class written in italics top right of the generalizing class:
Obviously this is a pure Sparxian invention as their support does not have an explanation for its origin.
I'd like to know if calling a method from a different class is considered a relationship on a class diagram.
Regards.
Not always. Some types of relationships (e.g. a uses b, a notifies b, etc) can be implemented or supported by calling of an object's method thoough.
It depends on how closely the class diagram represents relationships. That is a design choice.
How do i model a call to a static method in a class diagram ? Can someone show me a link to a class diagram that has done that?
for example there's a class called Animal. and i have another class called Vertibrates, and it has a method which is static (and this is the only method in that class). My Animal class will be using this static method of the class Vertibrate. Therefore how can i model it in class diagram ?
You don't. Well, not in a class diagram at least. Instead, you should use sequence chart diagrams to express method calls (whether static or dynamic).
You can't model the call directly in a class diagram (as #Imontrieux says), but you can model the relationship (i.e., that Animal uses (calls) static methods in Vertibrate; BTW, the correct spelling is Vertebrate), which I suspect is actually what you meant.
You use a UML dependency for this, not an association (since the latter are for associations between instances of the classes at each end)--- see How to show usage of static methods UML Classdiagram.
Great question. One thing the GoF do in Design Patterns is used notes to demonstrate intended uses. For example, from the section on the Command Pattern:
Command Pattern
While #user1315906 is technically correct that you don't model such things in Class Diagrams, but rather in Use Case or Sequence Diagrams, if it makes sense to note how something is intended to be used in a Class Diagram, you can use a note :)