How can i get class parameters of class file

Question

I want to read parameters of a class after compilation. I only need the names.

For example:

public class X {
   public String y;
   ...
}

I want to compile the code to a class file. Then have another java project read the names of classes in this case X and all of class's parameters in this case y.

Can i do it? If its possible, are the parameters have to be public?

Thanks.

EDIT:

I tried to use JSystem - an automation framework in java. To do it, do I need to read a class file and read all the class names and those parameters? I hope its understandable.

For people who know JSystem, I tried to make JRunner but web gui(with spring).

Please consider telling us more details of what you're trying to do (not 100% clear to me) and more importantly, about your motivation behind your request. I can't help wondering if this is an XY Problem in disguise. — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Apr 28, 2018 at 23:11
I'm not familiar with JSystem, but it sounds like what you're trying to do is what's called "reflection". Searching for that term might point you in the right direction. — Frank Riccobono
– Frank Riccobono, Commented Apr 28, 2018 at 23:17

Jeffrey Phillips Freeman · Accepted Answer · 2018-04-28 23:44:52Z

2

You want to use java reflection. The following code will give you all classes in a package:

 Reflections reflections = new Reflections("my.project.prefix");

 Set<Class<? extends Object>> allClasses = reflections.getSubTypesOf(Object.class);

Then to get the properties of a class you can do the following:

 for (Field f : getClass().getDeclaredFields()) {
    System.out.println("Field: " + f);
  }

edited Apr 28, 2018 at 23:44

answered Apr 28, 2018 at 23:37

Jeffrey Phillips Freeman

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