java java列出父类的所有子类
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java list all the child classes of a parent
提问by MBZ
Possible Duplicate:
At runtime, find all classes in a Java application that extend a base class
I need to get list of all the classes (child) which extends a particular class (parent) and then create an instance of them all.
我需要获取扩展特定类（父类）的所有类（子类）的列表，然后创建所有类的实例。
how should I do this in Java?
我应该如何在 Java 中执行此操作？
回答by Peter Lawrey
I would use http://code.google.com/p/reflections/
我会使用http://code.google.com/p/reflections/
Using Reflections you can query your metadata such as:
- get all subtypes of some type
- get all types/methods/fields annotated with some annotation, w/o annotation parameters matching
- get all resources matching matching a regular expression
使用反射，您可以查询元数据，例如：
- 获取某种类型的所有子类型
- 获取所有类型/方法/字段的注释，不带注释参数匹配
- 获取匹配正则表达式的所有资源
This can be used in an indexed or cached mode. As @Jagger suggests, a brute force search of every class is relatively slow. You can also limit the search by package e.g. com.mycom.*
这可以在索引或缓存模式下使用。正如@Jagger 所暗示的那样，对每个类的蛮力搜索相对较慢。您还可以按包限制搜索，例如com.mycom.*
