Structural design patterns

In software engineering, structural design patterns help delineate clean relationships between objects and simplify design. Unlike creational patterns that we saw previously, these patterns are quite varied and represent a bouquet of recipes for various situations.

Adaptor

Many times when you code, you come across situations where you have a new requirement, and a component that almost meets that requirement. A non-software example of this situation is the power adapter: a three-legged plug from India can't be connected to a two-pronged outlet in the US. You need to use a power adapter to enable compatibility and use both entities.

In the pattern, there is an adaptor class that proxies what...