public class ServiceA {
    void runServiceA() {
    }
}

public class ServiceB {
    void runServiceB() {
    }
}

public class AdapterServiceA {
    ServiceA s1 = new ServiceA();

    void runService() {
        s1.runServiceA();
    }
}

public class AdapterServiceB {
    ServiceB sB = new ServiceB();

    void runService() {
        sB.runServiceB();
    }
}

// 어댑터 패턴 적용 전
public class ClientWithNoAdapter {
    public static void main(String[] args) {
        ServiceA sA = new ServiceA();
        ServiceB sB = new ServiceB();

        sA.runServiceA();
        sB.runServiceB();
    }
}

// 어댑터 패턴 적용 후
public class ClientWithAdapter {
    public static void main(String[] args) {
        AdapterServiceA asa1 = new AdapterServiceA();
        AdapterServiceB asb1 = new AdapterServiceB();

        asa1.runService();
        asb1.runService();
    }
}