Which are use cases and class diagrams in Software Engineering?

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Use cases are graphical represenation of system parts and there interaction that is taking place. Normally we depict
the part of the systems who are involved in some activity as actors.
Class Diagrams are a part of designing proess. After coming up with use cases of the system, we take each use case and come up with the
classes that we need to perform that functionality. Each class will have Class Name, Attribues and Operations associate with it.
Some of the features of the classes are -
- Each class should have well defined responsibilities
- These responsibilities should be cohesive i.e. the system as a whole looks sensible and looks together.
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