如何创建通用< T>类，以便T扩展Collections< String&gt ;? [英] How to create a generic <T> class so that T extends Collections<String>?

问题描述

我想创建一个泛型ThreadWorker类，它的泛型类型<T>接受扩展了<String>类型的Collection类的类.

I want to create a generic ThreadWorker class that it's generic type <T> accepts classes that extends Collection class of type <String>.

我尝试过:

public class Worker <T extends Collections<String>> extends SwingWorker<VectorDetails , String>    

但是我得到一个错误:

The type Collections is not generic; it cannot be parameterized with arguments <String>

也是我写的时候:

public class Worker <T extends Collections> extends SwingWorker<VectorDetails , String>  

它可以编译，但是那不是我所需要的，因为可以使用不是String的其他类的类型来创建此Worker类的实例. (类似于< Integer>，<Character>等.).

It compiles fine, but thats not what I need since instances of this Worker class can be created with types of other classes which are not String. (Like < Integer> , <Character> , etc..).

如何强制用户使用扩展/实现包含字符串的Collection类的类型来创建我的类的实例?

How can I force the user to create instances of my class with types that extends/implements Collection class that holds Strings?

推荐答案

您正在寻找什么吗?

class StringCollection<T extends Collection<H>, H extends String> {}

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