Why is dependency preferred over aggregation?

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Shyam Tm

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t represents a relationship between two or more objects where an object is dependent on another object(s) for its specification or implementation. This is represented by a dashed arrow and It is a specialized form of Association where all object have their own lifecycle but there is ownership. This...
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t represents a relationship between two or more objects where an object is dependent on another object(s) for its specification or implementation. This is represented by a dashed arrow and It is a specialized form of Association where all object have their own lifecycle but there is ownership. This represents “whole-part or a-part-of” relationship. This is represented by a hollow diamond followed by a line read less
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