Aggregate Objects

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Objects which contain data are composed of other objects. For example, the Point class (point.py) presented earlier consists of two integer objects representing the x- and y-coordinates. If create two Point objects

the result graphically would be as shown below

Attach:(Defining Classes/ptobjects.png)

Object Composition

The two string fields are reference variables since strings are objects. When the \class{Student} object is created, the data fields become aliases of the strings passed to the constructor.

\begin{define}[aggregate object] an object composed, in part, of other objects; it contains data fields which are references to other objects. \end{define}

\subsection{The Address Class}

Consider the \class{Address} class below which defines an object representing a person’s mailing address. The class does not contain many useful methods at this time, however, it does provide another class example.

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