Java – represents Association and inheritance in UML

If I have a class definition similar to the following:

class A extends class B {
private B b
}

How can I express this relationship in UML? This is also a bad design. Why?

Solution

The extensions keyword in Java represents a generalization, which is displayed as a hollow triangle in UML

The association is displayed as a solid line The role name B is appended to class B and prefixed with a private symbol The bigger one tells it that it is a's property

There is basically nothing wrong with this