Question

我试图覆盖从父类继承抽象方法的子类中的方法。我试图更改通用返回类型，但我有点困惑。

基础通用类：

public abstract class BaseAdapter<T extends IEvent> {
   private List<T> events;

   public BaseAdapter(List<T> events) {
      this.events = events;
   }

   public List<T> sort() {
      // Some sorting...
      return newFilteredEvents;
   }
}

儿童班：

public class AdapterEvent extends BaseAdapter<Event> {
   public AdapterEvents(List<Event> events) {
      super(events);
   }
}

实施：

public abstract class BaseView extends View {

   private BaseAdapter<IEvent> events;

   @Override
   protected View onCreate(Context context) {
       View view = super.onCreate(context);

       this.events = getAdapter();

       return view;
   }

   /**
    * The child class should provide an adapter
    */
   protected abstract BaseAdapter<IEvent> getAdapter();
}

我希望覆盖参数化方法的子View类：

public class EventView extends BaseView {

   @Override
   protected View onCreate(Context context) {
      return super.onCreate(context):
   }

   @Override
   protected BaseAdapter<IEvent> getAdapter() {
      List<Event> events = EventManager.getInstance().getEvents();

      return new AdapterEvent(events);
   }

}

这是Eclipse抛出错误消息的地方：

Type mismatch: cannot convert from AdapterEvents to BaseAdapter<IEvent>

注意类和接口：Event和IEvent：

public interface IEvent {
   public void setId(long id);
   public long getId();

   public void setStartMillis(long start);
   public long getStartMillis();

   public void setEndMillis(long end);
   public long getEndMillis();
}

继承自IEvent

的Model类

public class Event implements IEvent {
   private long id;
   private long startTime, endTime;

   @Override
   public void setId(long id) {
      this.id = id;
   }

   @Override
   public long getId() {
      return this.id;
   }

   // The other inherited methods...
}

我想要实现的是编写更抽象的代码，因为这些类，接口将由多个类扩展（在我的情况下，不同的View类型）。这些是抽象类：BaseAdapter，BaseView，IEvent，这些是实现：AdapterEvent，EventView，Event。

Java：覆盖泛型方法

0 个答案: