Object Diagram Vs Class Diagram

Objects are used to represent the static view of an object oriented system. What is an object diagram.

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A static object diagram is an instance of a class diagram.

Object diagram vs class diagram. An object diagram is also a type of static structural diagram. Objects are the real world entities whose behavior is defined by the classes. Object diagram on the other hand is a graph of instances including objects and data values.

It shows a snapshot of the detailed state of a system at a point in time. It shows a snapshot of the detailed state of a system at a point in time thus an object diagram encompasses objects and their relationships at a point in timeit may be considered a special case of a class diagram or a communication diagram. A static object diagram is an instance of a class diagram.

Class diagrams are used for two main. The figure shows the class diagram of party composition structure and a particular snapshot at a point in time. An object diagram is a snapshot of the objects in a system at a point in time.

We cannot define an object without its class. These diagrams which describe the classes with the help of diagrams are called class diagrams. These diagrams also show the operations of the classes attributes and relationships between different classes.

The use of object diagrams is fairly limited mainly to show examples of data structures. We can use an object diagram to show an example configuration of a snapshot from a class diagram. Object is an instance of a particular moment in runtime including objects and data values.

Object and class diagrams are somewhat similar. A static uml object diagram is an instance of a class diagram. In object oriented modeling a class diagram is the primary block for building the whole structure.

The key difference between class diagram and object diagram is that the class diagram represents the classes and their relationships between them while the object diagram represents the objects and their relationships between them at a particular moment. The basic idea is that class diagrams focus on classes and object diagrams focus on objects but it is possible to mix classes and objects on the same diagram for various purposes so the separation is not rigid. It shows a snapshot of the detailed state of a system at a point in time.

Object diagram was defined in now obsolete uml 142 specification as a graph of instances including objects and data values. Class diagrams show the logical static structure of a system and are central the unified modeling language.

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