如何获得封闭课程？

问题描述

我知道 Class.getDeclaredClasses（）可以获取它声明但不包含匿名类的所有类。

I know Class.getDeclaredClasses() can obtains all the classes that it has declared but doesn't including anonymous classes.

我想知道有没有办法通过封闭类获取所有封闭的类？例如，我想获得在 Root 中定义的所有封闭类以用于测试目的。

I'd like to know is there a way to get all the enclosed classes via the enclosing class ? for example, I want to get the all enclosed classes defined in Root for test purpose.

class Root{
   void run(){
      Runnable task = new Runnable(){
         public void run(){}
      };

      task.getClass().getEnclosingClass();// return Root.class
      // but I want to get all enclosed class via Root.class, for example:
     // Root.class... == task.getClass() 
   }
}

预期结果是： [任务类] 。

推荐答案

如果您知道匿名类的命名方案，可以尝试使用 Root 的 ClassLoader ：

If you know the naming scheme of your anonymous classes, you can try to load it with Root's ClassLoader:

javac的命名方案是< enclosing_class_name> $< anonymous_class_number> ：

Naming scheme for javac is <enclosing_class_name>$<anonymous_class_number>:

Class<?> enclosing = Root.class;

try{
    Class<?> anon1 = enclosing.getClassLoader().loadClass(enclosing.getName() + "$1");
    System.out.println(anon1); // prints: class Root$1
} catch (ClassNotFoundException e) {
    System.out.println("no anonymous classes");
}

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