public interface Target {
  public void request();
}

public class Adapter implements Target{
  private Adaptee adaptee = new Adaptee();
  public void request() {
    adaptee.specificRequest();
  }
}

public class Adaptee {
  public void specificRequest() {
    System.out.println("specificRequest()が呼び出されました");
  }
}

public class Client {
  public static void main(String[] args) {
    Target t = new Adapter();
    t.request();
  }
}

C:\JavaHello\Adapter>java Client
specificRequest()が呼び出されました

C:\JavaHello\Adapter>