elements on a Class diagram - mobile bank

Class Diagrams

        Class diagrams identify the class structure of a system, including the properties and methods of each class. Also depicted are the various relationships that can exist between classes, such as an inheritance relationship. The Class diagram is one of the most widely used diagrams from the UML specification. Part of the popularity of Class diagrams stems from the fact that many CASE tools, such as Rational XDE, will auto-generate code in a variety of languages, including Java, C++, and C#, from these models. These tools can synchronize models and code, reducing your workload, and can also generate Class diagrams from object-oriented code, for those "code-then-design" maintenance projects.

Notation

The elements on a Class diagram are classes and the relationships between them

Class	Classes are the building blocks in object-oriented programming. A Class is depicted using a rectangle divided into three sections. The top section is the name of the Class. The middle section defines the properties of the Class. The bottom section lists the methods of the class.
Association	An Association is a generic relationship between two classes, and is modeled by a line connecting the two classes. This line can be qualified with the type of relationship, and can also feature multiplicity rules (eg. one-to-one, one-to-many, many-to-many) for the relationship.
Composition	If a class cannot exist by itself, and instead must be a member of another class, then that class has a Composition relationship with the containing class. A Composition relationship is indicated by a line with a filled diamond.
Dependency	When a class uses another class, perhaps as a member variable or a parameter, and so "depends" on that class, a Dependency relationship is formed. A Dependency relationship is indicated by a dotted arrow.
Aggregation	Aggregations indicate a whole-part relationship, and are known as "has-a" relationships. An Aggregation relationship is indicated by a line with a hollow diamond.
Generalization	A Generalization relationship is the equivalent of an inheritance relationship in object-oriented terms (an "is-a" relationship). A Generalization relationship is indicated by an arrow with a hollow arrowhead pointing to the base, or "parent", class.