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<h2><font color="#009999">More Patterns (cont.)</font></h2>
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<th>Pattern Name</th>
<th>Description</th>
<th>Example</th>
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<th>Factory Method</th>
<td>A virtual constructor can be redefined by derived classes</td>
<td>Collection classes that derive from a common base class redefine the
create_iterator function</td>
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<th>Flyweight</th>
<td>Uses shared objects instead of large numbers of separate objects with
identical state</td>
<td>A word processor uses shared objects for styled characters rather than a
separate object for each character</td>
</tr>
<tr>
<th>Interpreter</th>
<td>A class hierarchy represents grammar rules. The interpreter recursively
evaluates a parse tree of rule objects</td>
<td>A program interactively evaluates mathematical expressions by building
and evaluating a parse tree</td>
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