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Explain about subsystem and object of object oriented modeling
A subsystem is a grouping of elements of that constitutes a specification of behaviour offered by other contained elements.
An object is an instance of the class. The object can be shown as instance of a class, with path name along with attributes. Multiple objects can be connected with links. The notation for named and unnamed objects, object with path name, active objects and object with attributes, self linked object and multiple objects is shown as:
Figure: Different types of objects
What is the significance of the memory table 'SCREEN'? At runtime, attributes for every screen field are stored in the memory table called 'SCREEN'. We need not declare this
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Should validation (did the user enter a real date) occur server-side or client-side? Why? Validation will be done in both sides i.e., at the server side and client side. Ser
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