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I have a question in UML. I'm a beginner in UML and I do not know if I can do this :
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The "0.. *" notation is used to denote "zero or more" (many). The following notation indicates that every object in Class A is associated with zero or more objects in Class B, and that every object in Class B is associated with exactly one object in Class A.
Exactly one object. This is the default multiplicity of an association according to UML. 0..* No object or at least one.
Object-Oriented Concepts UML can be described as the successor of object-oriented (OO) analysis and design. An object contains both data and methods that control the data. The data represents the state of the object. A class describes an object and they also form a hierarchy to model the real-world system.
The composition relationship is represented by a straight line with a black diamond at one end. In UML, it can exist between two or more classes. It is a part of the association relationship. It is a part of the aggregation relationship.
You can't. A composition means a whole/part relationship and it can only be 0*-1, 1*-1 or 0*-0..1 at most.
For more information on the subject I'd read this: https://www.uml-diagrams.org/composition.html
EDIT: Think about what a whole/part relationship is. A bedroom is part of a house, but the same bedroom cannot belong to multiple houses. However, a house can have multiple bedrooms. This is the same kind of relationship as in the house/bedroom case.
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