Adapter
On This Lesson 4 topics
The content for this lesson is written and waiting for review. The outline below shows what it covers. It will be published once it is approved.
In this lesson
make a foreign interface fit yours.
Planned topics
- Problem: a third-party API has a different shape from what your code expects.
- Like a travel plug adapter: it changes the shape, not the power.
- Your code depends on your interface; the adapter translates the calls.
- It protects your core from outside changes.
- JDK example:
Arrays.asList,InputStreamReader.
Draft outline details
Demonstration
interface CurrencyRates { Money convert(Money m, String to); }
class VendorRatesAdapter implements CurrencyRates {
private final VendorApi api;
...
}Check your understanding
What does an Adapter change?
Show answer
The shape of an interface, not what it does.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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