Understanding Design Patterns (adapters)

Adapter mode, convert different interfaces, achieve compatibility.

Specific environment

• Interface compatible
  -Use existing classes, but in a different way from the original, you need to convert
  -Existing interfaces are compatible with third-party components
  -Retains and uses the functionality of the original system class, but the client access mode changes while the original code cannot be modified

• Conversion between similar functional classes

A class of questions

Incompatible interface classes, not cooperating

Solution Solutions

3 characters:

• Destination interface target: Provides the expected usage, implemented by a class or interface
• Adaptee by the appropriate ligand: the original use of the class, implemented by the class or interface
• Adapter Adapter: Encapsulates the adaptee reference, implements or inherits Target, overrides the target method, encapsulates the Adaptee method

class adapters and Object adapters

Java does not support multiple inheritance and is not currently discussed

Advantages and Disadvantages

Pros:

• reusing classes, reducing the amount of development
• extensible Legacy class functionality
• can be decoupled via the target interface, using multiple adapters
• by the adapter to the interface user transparent
• target interface and the adapter

Cons:
for object adapters, the adapter is more complex to write or modify

Because the original system is required to provide an interface (that is, the API of the adapter), and it needs to understand its applicable environment

Reference

Design Patterns Learning Notes-Adapter mode, Wang Juqiang

Understanding Design Patterns (adapters)