Answer
The common types of relations among classes are:
Association
Aggregation
Composition
Inheritance
Dependency
Work Step by Step
The common types of relationships among classes are:
Association: This represents the relationship between two classes where one class uses the services provided by the other class. In UML, an association is represented by a solid line connecting two classes.
Aggregation: This represents a "has-a" relationship between two classes, where one class has an instance of the other class. In UML, aggregation is represented by a diamond shape on the aggregate class and a solid line connecting the aggregate and part classes.
Composition: This represents a strong "has-a" relationship between two classes, where the composite class owns and is responsible for the lifecycle of the part class. In UML, composition is represented by a filled diamond shape on the composite class and a solid line connecting the composite and part classes.
Inheritance: This represents an "is-a" relationship between two classes, where one class inherits the attributes and behaviors of another class. In UML, inheritance is represented by an arrow pointing from the subclass to the superclass.
Dependency: This represents a relationship where one class depends on another class for some of its functionality. In UML, a dependency is represented by a dotted line connecting two classes.
