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CSE1720_F11_Lecture06_Aggregation_Graphics_IV -...

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CSE 1720 Lecture 6 Aggregation, Graphics IV Announcements: Lectures 7-10 assigned reading: Ch 9, JBA 2 Goals/ To do: How to create, copy , and delegate to aggregates example aggregates: Pixel , Picture , Graphics2D Create, modify , and iterate over collections Implement traversal over a collection Implement search within a collection Use services of Graphics2D for drawing Goals/ To understand: recognize aggregates from their APIs characterize and distinguish between two traversal techniques distinguish between aliases, shallow copies, and deep copies of aggregrates understand the characteristics of the “current settings” graphical model 3 Today’s Topic Issues with making a copy of an aggregate 4
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The Aggregation Relationship A class C is said to be an aggregate if and only if one of its attributes is an object reference (say of type T ) Aggregation is the name of the relationship between C and T . an object of type C HAS-A object of type T the object of type T is called the aggregated part Key observation: it is possible that the object of type T can be may have a different lifetime of the object of type C We will demonstrate this next… (but to do this we must first explain the Stock and Investment classes) 5 The class Stock
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