设计模式之适配器模式(类适配器、对象适配器、源码体现)

//1.usb输出类
public class Usb {
    //使用usb接口作为输出
    public String out(){
        return "USB";
    }
}

//2.TypeC输入接口
public interface TypeC {
    //输入接口是type
    String in();
}

/**
 * 3.笔记本读取硬盘需要typec口，但是我们只有usb口，那么就需要一个适配器把usb转为typec
 */
public class MacBook {
    public void read(TypeC typeC){
        if (typeC.in().equals("TypeC")){
            System.out.println("开始进行读取");
        }else {
            System.out.println("不是TypeC口，无法读取");
        }
    }
}

/**
 * 4.把usb转为typec
 */
public class InterfaceAdapter extends Usb implements TypeC{
    @Override
    public String in() {
        String out = this.out();
        out = "TypeC";
        return out;
    }
}

public class Test {
    public static void main(String[] args) {
        //直接使用适配器进行读取就可以了
        InterfaceAdapter interfaceAdapter = new InterfaceAdapter();
        MacBook macBook = new MacBook();
        macBook.read(interfaceAdapter);//结果：开始进行读取
    }
}

public class InterfaceAdapter implements TypeC {
    private Usb usb;
    InterfaceAdapter(Usb usb){
        this.usb = usb;
    }
    @Override
    public String in() {
        String out = usb.out();
        out = "TypeC";
        return out;
    }
}

public static void main(String[] args) {
        InterfaceAdapter interfaceAdapter = new InterfaceAdapter(new Usb());
        MacBook macBook = new MacBook();
        macBook.read(interfaceAdapter);//结果：开始进行读取
    }

/**
   * Return the HandlerAdapter for this handler object.
   * @param handler the handler object to find an adapter for
   * @throws ServletException if no HandlerAdapter can be found for the handler. This is a fatal error.
   */
  protected HandlerAdapter getHandlerAdapter(Object handler) throws ServletException {
    if (this.handlerAdapters != null) {
      for (HandlerAdapter adapter : this.handlerAdapters) {
        if (adapter.supports(handler)) {
          return adapter;
        }
      }
    }
    throw new ServletException("No adapter for handler [" + handler +
        "]: The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler");
  }