[英]Use HashMap or something similar to store lists of objects
I have several classes that all extend a certain class. 我有几个班级都扩展了某个班级。 I want to use a HashMap
or something similar to hold an ArrayList
for each of those classes, as kind of shown below. 我想使用一个HashMap
或类似的东西来为每个这些类保存一个ArrayList
,如下所示。
HashMap<? extends MasterClass, ArrayList<? extends MasterClass>>
I want to call get
with the extended class. 我想打电话给get
与扩展的类。 This should return the ArrayList
of that class. 这应该返回该类的ArrayList
。 Is this possible? 这可能吗?
get(Class);
You need to have Class<? extends MasterClass>
您需要Class<? extends MasterClass>
Class<? extends MasterClass>
as key of your map: Class<? extends MasterClass>
为地图的键:
Map<Class<? extends MasterClass>, List<? extends MasterClass>> map
= new HashMap<Class<? extends MasterClass>, List<? extends MasterClass>>();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.