Relationships in the UML:
1. Dependency:
A dependency relationship specifies that a change in the specification of
one thing may affect another thing that uses it. Graphically, a
dependency is rendered as a dashed line, directed to the thing that is
dependent on.
Notation:
2. Association:
An association is a structural relationship, specifying that objects of one
thing are connected to objects of another. When an association connects
two classes you can navigate from one object of one class to an object
of another class and vice versa. Graphically an association is
represented as a solid line connecting more than one class.
Notation:
3. Generalization:
It is a relationship between a general thing (called the super class or
parent) and a more specific kind of that thing (called the subclass or
child). With generalization relationship a child can inherit all the
structure and behavior of parent. A child may add new structure or
behavior or it may modify the behavior of the parent. Graphically it is
represented as a solid line with hollow triangle placed near to the super class.
Notation:
4. Realization:
A realization is a schematic relationship between classifiers in which
one classifier specifies a contract that another classifier guarantees to
carry out. Graphically a realization is represented as dashed directed line
with the hollow triangle pointing to the classifier that specifies the
contract.
Notation:
5. Aggregation:
Aggregation is a part whole relationship where an aggregate class
connects multiple subclasses which are part of aggregate class. It is
represented with a diamond towards aggregate class.
Notation:
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