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Illustrate some notations of object modeling notations
A classifier is a mechanism which describes behavioural and structural features. In UML significant classifiers are class, signals, data type, interface, use case, nodes, components, and subsystems.
A class is a description of a set of objects which share same attribute, semantics, operations, and relationships. In UML, it is represented by a rectangle.
An attribute is a named feature of a class which describes a range of values that instances of property may hold. In UML, they are listed in the compartment just below the name of that class.
An operation is implementation of a service which can be requested from any object of class to affect behaviour. In UML, they are listed in the compartment just below to that of the class attribute.
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The logic circuit shown in the given figure can be minimised to Ans. The minimised figure of logic diagram is D, the output of the logic circuit is as Y=(X+Y')'+(X'+(X+
A source is an object that produces an event. This happens when the internal state of that object changes in some way. A listener is an object that is notified when an event happen
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