二十三种设计模式全面解析-适配器模式：代码的奇迹之桥，连接你的世界！

// 目标接口
interface TargetInterface {
    void request();
}
// 适配者类
class Adaptee {
    void specificRequest() {
        System.out.println("适配者的特殊请求");
    }
}
// 适配器类（类适配器）
class Adapter extends Adaptee implements TargetInterface {
    @Override
    public void request() {
        specificRequest();
    }
}
// 客户端代码
public class Client {
    public static void main(String[] args) {
        TargetInterface target = new Adapter();
        target.request();
    }
}

// 目标接口
interface TargetInterface {
    void request();
}
// 适配者类
class Adaptee {
    void specificRequest() {
        System.out.println("适配者的特殊请求");
    }
}
// 适配器类（对象适配器）
class Adapter implements TargetInterface {
    private Adaptee adaptee;
    Adapter(Adaptee adaptee) {
        this.adaptee = adaptee;
    }
    @Override
    public void request() {
        adaptee.specificRequest();
    }
}
// 客户端代码
public class Client {
    public static void main(String[] args) {
        Adaptee adaptee = new Adaptee();
        TargetInterface target = new Adapter(adaptee);
        target.request();
    }
}

// 目标接口
interface TargetInterface {
    void targetRequest();
}
// 适配者接口
interface AdapteeInterface {
    void adapteeRequest();
}
// 适配者类
class Adaptee implements AdapteeInterface {
    @Override
    public void adapteeRequest() {
        System.out.println("适配者的请求");
    }
}
// 适配器类（双向适配器）
class Adapter implements TargetInterface, AdapteeInterface {
    private Adaptee adaptee;
    Adapter(Adaptee adaptee) {
        this.adaptee = adaptee;
    }
    @Override
    public void targetRequest() {
        adaptee.adapteeRequest();
    }
    @Override
    public void adapteeRequest() {
        System.out.println("适配器的请求");
    }
}
// 客户端代码
public class Client {
    public static void main(String[] args) {
        Adaptee adaptee = new Adaptee();
        Adapter adapter = new Adapter(adaptee);
        // 使用适配器调用目标接口
        adapter.targetRequest();
        // 使用适配器调用适配者接口
        adapter.adapteeRequest();
    }
}

// 目标接口
interface PaymentGateway {
    void pay(double amount);
}
// PayPal支付类
class PayPal implements PaymentGateway {
    public void pay(double amount) {
        System.out.println("Paying $" + amount + " via PayPal.");
        // 实际的支付逻辑
    }
}
// 支付宝支付类
class Alipay {
    public void makePayment(double amount) {
        System.out.println("Making payment of $" + amount + " via Alipay.");
        // 实际的支付逻辑
    }
}
// 支付宝适配器类
class AlipayAdapter implements PaymentGateway {
    private Alipay alipay;
    public AlipayAdapter(Alipay alipay) {
        this.alipay = alipay;
    }
    public void pay(double amount) {
        alipay.makePayment(amount);
    }
}
// 客户端代码
public class Main {
    public static void main(String[] args) {
        PaymentGateway paypal = new PayPal();
        paypal.pay(100.0);  // 使用PayPal支付
        PaymentGateway alipay = new AlipayAdapter(new Alipay());
        alipay.pay(200.0);  // 使用适配器将支付宝接口转换为PaymentGateway接口支付
    }
}