适配器模式

Intent

• Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.
• Wrap an existing class with a new interface.
• Impedance match an old component to a new system

Structure

Structure

实例Demo

1. 类图

Adapter by keith

2. 代码:

public class Adapter {
    public static void main(String[] args) {
        Dog dog = new Dog();
        Flyable flyable = new FlyAdapter(dog);
        flyable.fly();
    }
}
//dog can't fly
class Dog {
    void running() {
        System.out.print("Dog is running");
    }
}
interface Flyable {
    void fly();
}
// adapter convert dog to be a flyable object
class FlyAdapter implements Flyable {
    Dog dog;

    public FlyAdapter(Dog dog) {
        this.dog = dog;
    }

    @Override
    public void fly() {
        dog.running();
    }
}

3. Output

Dog is running

Refenrence

1. Design Patterns
2. 设计模式