java - 我可以有一个返回泛型、泛型类型的方法吗？

Question

我的问题正是我的标题所说的。

我有以下类(class)

 public class StoreItem
 {
     //Lots of irrelevant information! :)
 }

 public class Store<T extends StoreItem>
 {
    private ArrayList<T> storeItems;
    //Other irrelevant information.
 }

 public abstract class StoreLoader<T extends StoreItem, S extends Store<T>> 
 {
     //Parsed xml document info obtained from file in constructor
     public StoreLoader (File toLoadFrom)
     {

     }

     //Here is where my question begins. I would like to do the following which states the method will return the same generic S that extends Story<of generic type T that extends storyitem>. I want to use the same T and S generics from the class definition above.
     public S<T> load ()
     {
         Store<T> store = new Store<T>(.....);
         //COde to read and process Store XML file
         return store;
     }
 }

编辑:我已经删除了 S 泛型，并将该类定为最终类。我仍然想看看这种事情是否可能!

Answer 1

在您的 StoreLoader 类定义中，S 已被限制为存储类型(您创建实例所用的特定 T 的类型)，因此当您在函数返回类型中写入“S”时，无需指定 T再次。