java - Java 中的泛型 - 使用抽象类进行类型删除

Question

我有通用类:

public class MyGenericClass<T> {
   T get(){
     return T;
    }
   ...
}

有 2 类:

public class CatService{
   MyGenericClass<Cat> generic;

   public CatService(MyGenericClass<Cat> generic){
   this.generic = generic;
   }
}

public class DogService{
   MyGenericClass<Dog> generic;

   public DogService(MyGenericClass<Dog> generic){
   this.generic = generic;
   }
}

我认为最好创建public abstact class Service :

public abstract class Service {
   MyGenericClass generic;

   public MyGenericClass (MyGenericClass generic){
   this.generic = generic;
   }
}

并让CatService和DogService扩展这个抽象服务。 他们将在构造函数中调用 super(MyGenericClass generic) 或 super(MyGenericClass generic) 来初始化泛型字段。

但是在这种情况下，当我尝试调用 MyGenericClass 方法时，我收到“未检查的调用”，当我尝试调用 T get() 时，我必须使用 (Cat) generic.get( ) 或 (Dog) generic.get();

有可能避免吗？

更新:需要指定泛型类型: extends Service<Cat>

public class CatService extends Service<Cat> {

   public CatService(MyGenericClass<Cat> generic){
   super(generic);
   }
}

public abstract class Service<T> {
   MyGenericClass<T> generic;

   public MyGenericClass (MyGenericClass<T> generic){
   this.generic = generic;
   }
}

Answer 1

也将 Service 类设置为通用。

public abstract class Service<T> {
   MyGenericClass<T> generic;

   public MyGenericClass (MyGenericClass<T> generic){
       this.generic = generic;
   }
}