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.
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.
UML class diagram is a handy tool in object-oriented design. I am using it currently and facing presenting an abstract class with UML. I googled it but got nowhere.
So I would like to ask how to express an abstract class in UML class diagram, and it must be able to differentiate from concrete class
You have to write the class name in italic :
Here Contexte is an abstract class and Structure is a "concrete" class
P. 99 of the specs says:
The name of an abstract Classifier is shown in italics, where permitted by the font in use. Alternatively or in addition, an abstract Classifier may be shown using the textual annotation {abstract} after or below its name.
I was wondering how we present a class that has both a "has-a" and "is-a" relationship with another class in a UML diagram.
I am wondering if this is correct:
A realize relation is used to either an <<interface>> or to an abstract class. So you would design it like this:
N.B.: The triangle from the realization must not overlap the class but touch it. Also there's likely a typo: seal instead of sell.
Simply use two relationships - one showing a generalization and a second showing association/shared aggregation/composite aggregation.
Below is an example with composite aggregation.
In case of association the method you suggested is an alternate notation having exactly the same semantics. You only need to use solid line not dashed for generalization as in my example. Dashed line depicts realization and points to an interface or any other specification that is implemented by class on the other end of realization arrow.
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)
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 :)