如何获取所有“参与”的班级在给定的对象中？
我有一个 java 对象，一个 Object 类的实例 - 这就是我所知道的。现在我需要创建一个参与其创建的Class-es列表，包括它自己的类、所有父类、其属性和方法的所有类。例如：
List obj = new ArrayList();
obj.add(new Integer(4));
obj.add(new Foo());
System.out.println(allRelatedClasses(obj));
应该输出这样的内容：
Object, List, Collection, Iterable, Serializable, Cloneable, RandomAccess,
ArrayList, Integer, Foo
Is it possible at all?
I have a java object, an instance of class Object - that's all I know about it. Now I need to create a list of Class-es that took participation in its creation, including its own class, all parent classes, all classes of its properties and methods. For example:
List obj = new ArrayList();
obj.add(new Integer(4));
obj.add(new Foo());
System.out.println(allRelatedClasses(obj));
Should output something like this:
Object, List, Collection, Iterable, Serializable, Cloneable, RandomAccess,
ArrayList, Integer, Foo
Is it possible at all?
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Reflections 库可以处理相当多的问题。
就“参与其创建的内容”而言，您需要将其从字节码中提取出来。有几个库可以帮助解决这个问题，例如 ASM 和 BCEL。如果您只需要所有依赖项，DepFind可能就足够了。
如果您需要将自己限制在您所说的“创建过程中涉及的内容”，那么您只需要 ctor 中涉及的类以及该 ctor 调用的方法。
然而，如果一个类使用任何反射，那么所有的赌注都将落空——这些类型的依赖关系很难追踪，并且很难/不可能识别实际使用了什么。
The Reflections library can handle quite a bit of that.
In terms of "what took part in its creation", you'll need to pull that out of the bytecode. There are several libraries that can help with this, like ASM and BCEL. If you just need all dependencies, DepFind might be enough.
If you need to limit yourself to what you said, "what's involved in its creation", then you'd only want the classes involved in the ctor and methods the ctor calls.
If a class uses any reflection, however, all bets are off--those types of dependencies are difficult to track down, and it's difficult/impossible to identify what's actually used.
当然，您可以使用反射来做到这一点。
obj.getClass()返回您自己的类，obj.getClass().getParent()返回其父类。然后你可以循环调用getParent()，直到到达Object。接口、字段、方法、注释也是如此。只是不要忘记，您应该调用
getDeclaredMethods()和getDeclaredFields()来获取所有方法和字段，包括私有方法和字段。并且您必须调用setAccessible(true)来处理私有成员。1小时的工作，你就完成了。去！祝你好运。
Sure, you can do it using reflection.
obj.getClass()returns your own class,obj.getClass().getParent()returns its parent. Then you can callgetParent()in loop until you arrive toObject.The same is with interfaces, fields, methods, annotations. Just do not forget that you should call
getDeclaredMethods()andgetDeclaredFields()to get all methods and fields including private. And you have to callsetAccessible(true)to deal with private members.1 hour of work and you are done. Go! Good luck.