How extends can be represented in class diagram?

The notation is a arrow with a white triangle at the end, basically the same that is used for defining the inheritance (extends) relationship in the UML class diagrams. The figure below (taken from Wikipedia) shows an example: Another source of interest may be AgileModeling.com.

How do you add relationships to a class diagram?

To show a composition relationship in a UML diagram, use a directional line connecting the two classes, with a filled diamond shape adjacent to the container class and the directional arrow to the contained class.

What is extends in UML?

In UML modeling, you can use an extend relationship to specify that one use case (extension) extends the behavior of another use case (base). This type of relationship reveals details about a system or application that are typically hidden in a use case.

How do you show implements in class diagram?

In domain modeling class diagrams, an implements relationship represents a class that implements the operations in a Java™ interface. As the following figure illustrates, an implements relationship is displayed as a dashed line with an unfilled arrowhead.

What is include and extend relationship?

“The include relationship is intended for reusing behaviour modeled by another use case, whereas the extend relationship is intended for adding parts to existing use cases as well as for modeling optional system services” (Overgaard and Palmkvist, Use Cases: Patterns and Blueprints.

What is extend in Java?

The extends keyword extends a class (indicates that a class is inherited from another class). In Java, it is possible to inherit attributes and methods from one class to another. We group the “inheritance concept” into two categories: subclass (child) – the class that inherits from another class.

What are the relationships in class diagram?

Relationships in class diagrams show the interaction between classes and classifiers. Such relationships indicate the classifiers that are associated with each other, those that are generalizations and realizations, and those that have dependencies on other classes and classifiers.

What is extended relationship?

An extend-relationship is a relationship from an extension use case to a base use case, specifying how the behavior defined for the extension use case can be inserted into the behavior defined for the base use case. It is implicitly inserted in the sense that the extension is not shown in the base use case.

What is the purpose of extends and include relationship in use case diagram?

Which relationships are used in class diagram?

The following topics describe the relationships that you can use in class diagrams:

• Abstraction relationships.
• Aggregation relationships.
• Association relationships.
• Association classes.
• Binding relationships.
• Composition association relationships.
• Dependency relationships.
• Directed association relationships.

Does Java have UML relationship?

In Java, a Has-A relationship simply means that an instance of one class has a reference to an instance of another class or an other instance of the same class. For example, a car has an engine, a dog has a tail and so on. In Java, there is no such keyword that implements a Has-A relationship.