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structure

The class adapter uses multiple inheritance to match one interface to another, as shown in the following figure.

The class adapter adapts by inheriting the adapted class. At this point, the instance of the adapted class and the instance of the adapted target class are the same object. Operations oriented to the adaptation target are transferred to call the instance's own methods that inherit from the adapted class.

The object adapter depends on the combination of objects, as shown in the following figure.

The object adapter adapts by holding the object of the adapted class, when the instance of the adapted target class maintains the instance of the adapted class. Operations oriented to the adaptation object will instead call the method of the adapted class.

Participant

Target (Shape)

-defines the domain-specific interfaces used by Client. This can be seen as the requirement of the target class.

Client (DrawingEditor)

-collaborate with objects that conform to the Target interface. There are no special requirements for the users of the adapter.

Adaptee (TextView)

-define an existing interface that needs to be adapted. This sentence may be debatable, because the adaptation of those interfaces does not depend on what Adaptee has, but on what Target needs.

Adapter (TextShape)

-adapt the interface of Adaptee to the interface of Target. The classes that really perform adaptation work have two ways: classful adaptation and object adaptation.

Collaboration

Client calls some operations in the Adapter instance. The adapter then invokes the operation of Adaptee to implement the request.

The request of the user of the Adapter interface, which is forwarded to Adaptee.

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