You review a design written by somebody else for an application and you find these: - an interface Shape with a method draw () - a class Circle that implements Shape - a class Rectangle that implements Shape - a class CompoundShape that: o implements interface Shape o aggregates 0 or more Shape objects, o has an extra method called add (Shape sh) o for implementing method draw () calls the draw () method for all aggregated Shape objects. You assume that a CompoundShape object is made of multiple shapes. What design pattern is at work in this application? Explain your answer.

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17 October, 22:18

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Anna Conley · Answer 1

This is the Composite pattern, one of the "Gang-of-Four" design patterns (check out their book!).