图书馆系统（C++)

 //目标接口
 public interface Target {
 ​
     void request();
 }

 public class Adaptee {
     void get(){
         System.out.println("成功");
     }
 }

 public class Adapter implements Target{
 ​
     //持有一个被适配者
     private Adaptee adaptee;
 ​
     public Adapter(Adaptee adaptee) {
         this.adaptee = adaptee;
     }
 ​
     @Override
     public void request() {
         adaptee.get();
     }
 }
 public class Client {
     public static void main(String[] args) {
         Target target = new Adapter(new Adaptee());
         target.request();
     }
 }

1. 将客户端代码和具体的类解耦，客户端不需要直到被适配者的细节

2. 具有良好的拓展性

练习：题目页面 (kamacoder.com)

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        while (num-->0){
            int t = scanner.nextInt();
            if(t ==1){
                computer computer = new computer();
                computer.chargeWithTypeC();
            }else{
                AdapterCharger adapterCharger = new AdapterCharger();
                adapterCharger.charge();
            }
        }
    }
}

interface USB{
    void charge();
}

interface TypeC{
    void chargeWithTypeC();
}

class TypeAdapter implements USB{
    private TypeC typeC;
    public TypeAdapter(TypeC typeC){
        this.typeC = typeC;
    }
    @Override
    public void charge() {
        typeC.chargeWithTypeC();
    }
}

//新电脑使用Type
class computer implements TypeC{

    @Override
    public void chargeWithTypeC() {
        System.out.println("TypeC");
    }
}

class AdapterCharger implements USB{

    @Override
    public void charge() {
        System.out.println("USB Adapter");
    }
}