Definition and use of adapter pattern-javaTutorial-php.cn

Definition of Adapter Pattern

Adapter pattern: Convert the interface of a class into another interface that the customer wants. The adapter pattern allows classes with incompatible interfaces to work together

Adapter Pattern：Convert the interface of a class into another interface clients expect.Adapter lets classes work together that couldn&#39;t otherwise because of incompatible interface.

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The alias of the adapter pattern is the wrapper pattern, which can be used as either a class structural pattern or an object structural pattern. The interface mentioned in the adapter pattern definition refers to a generalized interface, which can represent a method or a collection of methods.

Existing subclass, adapted object

public class Adaptee {public void adapteeMethod(){
        System.out.println("适配方法");
    }
}

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Adapter interface

public interface Target {/** * 适配的接口     */void adapteeMethod();/** * 新增接口     */void adapterMethod();
}

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Interface implementation

public class Adapter implements Target{private Adaptee adaptee;public Adapter(Adaptee adaptee) {this.adaptee = adaptee;
    }
    @Overridepublic void adapteeMethod() {this.adaptee.adapteeMethod();
    }

    @Overridepublic void adapterMethod() {
        System.out.println("新增接口");
    }
}

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Test

public static void main(String[] args) {
    Target target = new Adapter(new Adaptee());
    target.adapteeMethod();
    target.adapterMethod();
}

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The orchestration mode contains the following three roles:

1: Target( Target abstract class): The target abstract class defines the interface required by the customer, which can be an abstract class or interface, or a concrete class. In a class adapter, since the C# language does not support multiple inheritance, it can only be an interface.

　2: Adapter (adapter class): It can call another interface and serve as a converter to adapt Adaptee and Target. It is the core of the adapter pattern.

　3: Adaptee (Adapter class): The adapter is the adapted role. It defines an existing interface. This interface needs to be adapted. The adapter class covers the customer's wishes. business methods.

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Related labels：

model Design Patterns adapter

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