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Adapter Pattern

An Adapter Pattern says that just "converts the interface of a class into another interface that a client wants".

In other words, to provide the interface according to client requirement while using the services of a class with a different interface.

The Adapter Pattern is also known as Wrapper.


Advantage of Adapter Pattern

  • It allows two or more previously incompatible objects to interact.
  • It allows reusability of existing functionality.

Usage of Adapter pattern:

It is used:

  • When an object needs to utilize an existing class with an incompatible interface.
  • When you want to create a reusable class that cooperates with classes which don't have compatible interfaces.
  • When you want to create a reusable class that cooperates with classes which don't have compatible interfaces.

Example of Adapter Pattern

Let's understand the example of adapter design pattern by the above UML diagram.

UML for Adapter Pattern:

There are the following specifications for the adapter pattern:

  • Target Interface: This is the desired interface class which will be used by the clients.
  • Adapter class: This class is a wrapper class which implements the desired target interface and modifies the specific request available from the Adaptee class.
  • Adaptee class: This is the class which is used by the Adapter class to reuse the existing functionality and modify them for desired use.
  • Client: This class will interact with the Adapter class.
Adapter Pattern UML

Implementation of above UML:

Step 1

Create a CreditCard interface (Target interface).

Step 2

Create a BankDetails class (Adaptee class).

File: BankDetails.java

Step 3

Create a BankCustomer class (Adapter class).

File: BankCustomer.java

Step 4

Create a AdapterPatternDemo class (client class).

File: AdapterPatternDemo.java

Output

Next TopicBridge Pattern




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