Java繼承和通用問題

Question

我有下面的類/接口：

public class GenericViewModel<T extends AbstractDatabaseObject> { 
    private Class<?> type; 

    @SuppressWarnings("unchecked") 
    public GenericViewModel(Class<?> cl) { 

     type = cl; 
    }  
} 

和專業化：

public class PersonViewModel extends GenericViewModel<Person> implements IPersonViewModel{ 
    public PersonViewModel() { 
     super(Person.class); 
    } 

} 

現在，我的問題是，在主持人：

public class GenericPresenter implements IGenericView.IGenericViewListener { 

    private GenericViewModel<AbstractDatabaseObject> model; 
    private IGenericView view; 

    public GenericPresenter(GenericViewModel<AbstractDatabaseObject> model, IGenericView view) { 
     this.model = model; 
     this.view = view; 
     view.addListener(this); 
    } 
} 

更確切地說，我不能用給定的參數調用超類的構造函數：

public class PersonPresenter extends GenericPresenter { 

    PersonViewModel model; 
    IPersonView view; 

    public PersonPresenter(PersonViewModel model, IPersonView view) { 

     super(model, view); // Here is the problem. No such constructor in superclass found 


    // IGenericView i = (IGenericView) view; <-- this seems to work 
    // GenericViewModel<AbstractDatabaseObject> m = model; <-- this doesn't 


    } 
} 

我必須改變什麼？

Answer 1

嘗試改變這種方式GenericPresenter類：

private GenericViewModel<? extends AbstractDatabaseObject> model; 
private IGenericView view; 

public GenericPresenter(GenericViewModel<? extends AbstractDatabaseObject> model, 
         IGenericView view) { 
    this.model = model; 
    this.view = view; 
    view.addListener(this); 
}