Adapter pattern in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Adapter pattern in software design?

The Adapter pattern allows two incompatible interfaces to work together by converting the interface of one class into another expected by clients.

beginner

Why is the Adapter pattern useful in system design?

It helps reuse existing code with incompatible interfaces without changing their source code, promoting flexibility and easier integration.

intermediate

What are the main components of the Adapter pattern?

1. Target: The interface expected by the client.<br>2. Adaptee: The existing incompatible interface.<br>3. Adapter: Converts Adaptee's interface to Target's interface.

intermediate

How does the Adapter pattern differ from the Decorator pattern?

Adapter changes an interface to match another, while Decorator adds new behavior to an object without changing its interface.

beginner

Give a real-life analogy for the Adapter pattern.

An electrical plug adapter lets a plug from one country fit into a socket of another country by converting the plug shape, similar to how software adapters convert interfaces.

What role does the Adapter play in the Adapter pattern?

A Removes unused methods

B Adds new features to an object

C Creates new objects

D Converts one interface to another compatible interface

The Adapter converts the interface of the Adaptee to the Target interface expected by the client.

Which component in the Adapter pattern is the existing incompatible interface?

A Adaptee

B Adapter

C Client

D Target

The Adaptee is the existing interface that is incompatible with the client’s expected interface.

The Adapter pattern is mainly used to:

A Allow incompatible interfaces to work together

B Add new behavior to objects

C Create new classes dynamically

D Manage object lifecycles

Adapter pattern enables two incompatible interfaces to communicate by converting one interface to another.

Which of the following is NOT a benefit of using the Adapter pattern?

A Code reuse without modification

B Interface compatibility

C Adding new methods to existing classes

D Flexibility in integrating legacy systems

Adapter does not add new methods; it only converts interfaces.

In a real-world example, an electrical plug adapter is similar to which software design pattern?

A Singleton

B Adapter

C Observer

D Factory

An electrical plug adapter converts one plug type to another, just like the Adapter pattern converts interfaces.

Explain the Adapter pattern and its main components with a simple example.

Think about how two incompatible things can work together using a converter.

Describe a scenario where using the Adapter pattern improves system design.

Consider integrating old and new systems.