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\begin{center}
{\LARGE\bf \sf Software Engineering} \\
\vspace{0.15in} {\Large\bf \sf CSE470 \hspace*{4.0truein} Spring 2002} \\
\vspace{0.15in}
{\Large \bf \sf Homework 1 \hspace*{3.3truein} Due: 1/24/2002}
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\vspace{0.2in}

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\begin{enumerate}
\item
An {\em abstract class} is class from which no objects are
instantiated and serves as a common parent in an inheritance
hierarchy. For example, a \textbf{polygon} abstract class could be the
superclass for a \textbf{triangle} and \textbf{square} class. Only
\textbf{squares} and \textbf{triangles} would be instantiated, but all
the common attributes would be in \textbf{polygon}. You may
find abstract classes useful in this problem.

We want to design a drawing tool for simple finite state machines. A
{\em machine} is a collection of one or more {\em states} and zero or
more {\em transitions}. Our customers can't decide whether they want
circular states or rectangular states with rounded corners, each of
which has it's own drawing format, so we'll allow both forms in our
tool. Each state can have zero or more transitions outbound, and zero
or more transitions inbound. States have an $x$ and $y$ location on
the canvas and a name string. Transitions have a string that denotes
the transition expression.  Draw the class diagram to represent the
figures used in this tool (state machine, states (both kind), and
transitions). Be sure to get the multiplicities correct, show all
relevant associations, and show the attributes mentioned above.  Here
is an example of one of these goofy diagrams:
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\epsfig{file=s02hw1.eps,width=2.5in}
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Note: You may hand-draw the diagram. If you do, use the \LaTeX\
\verb|\vspace| command to make white space. For example, \verb|\vspace{2in}|
reserves two inches of space on the page.  
\answer{}

\item Describe the difference between {\em generalization} and {\em
abstraction}. Don't simply define each.
\answer{}

\end{enumerate}

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